https://codeforces.com/gym/103202/problem/D
1.首先对于ans来说，最大值为全r
容易求得：
ll res = 0;
for(ll i = 1;i <= n;i += 2){
res += n - i + 1;
}
打表发现：
每个答案的前n / 2 + 1都是rr不断向前移动，故n >= 200的情况解决
观察表尾部可以发现
偶数的情况下之后的尾部形式都为：{“bbbbbbbbbbbbbbr”,“bbbbbbbbbbbbbrb”,“bbbbbbbbbbbbbrr”,“bbbbbbbbbbbbrbr”,“bbbbbbbbbbbbrrb”,“bbbbbbbbbbbbrrr”,这样
奇数都为：
{“bbbbbbbbbbbbrb”,“bbbbbbbbbbbrbr”,“bbbbbbbbbbbrrr”,“bbbbbbbbbbrbrb”,“bbbbbbbbbbrrbr”,"bbbbbbbbbbrrr
打表出一些后缀，然后输出
并且可以暴力或者打表输出较小的n的情况
#include <bits/stdc++.h>
using namespace std;
const int Mn = 1e5 +5;
#define ll long long
ll n;
ll res;
string sans[28][100] = {
{
"r"},
{
"br","rb","rr"},
{
"brb","rbr","rrr"},
{
"bbrb","brbb","brbr","brrr","rbbr","rbrb","rbrr","rrbr","rrrb","rrrr"},
{
"bbrbb","brbbr","brbrr","brrrb","rbbrb","rbrbr","rbrrr","rrbrb","rrrbr","rrrrr"},
{
"bbbrbb","bbrbbb","bbrbbr","bbrbrr","bbrrrb","brbbbr","brbbrb","brbbrr","brbrbr","brbrrb","brbrrr","brrbrb","brrrbb","brrrbr","brrrrr","rbbbrb","rbbrbb","rbbrbr","rbbrrr","rbrbbr","rbrbrb","rbrbrr","rbrrbr","rbrrrb","rbrrrr","rrbbrb","rrbrbb","rrbrbr","rrbrrr","rrrbbr","rrrbrb","rrrbrr","rrrrbr","rrrrrb","rrrrrr"},
{
"bbbrbbb","bbrbbbr","bbrbbrr","bbrbrrb","bbrrrbb","brbbbrb","brbbrbr","brbbrrr","brbrbrb","brbrrbr","brbrrrr","brrbrbb","brrrbbr","brrrbrr","brrrrrb","rbbbrbb","rbbrbbr","rbbrbrr","rbbrrrb","rbrbbrb","rbrbrbr","rbrbrrr","rbrrbrb","rbrrrbr","rbrrrrr","rrbbrbb","rrbrbbr","rrbrbrr","rrbrrrb","rrrbbrb","rrrbrbr","rrrbrrr","rrrrbrb","rrrrrbr","rrrrrrr"},
{
"bbbbrbbb","bbbrbbbb","bbbrbbbr","bbbrbbrr","bbbrbrrb","bbbrrrbb","bbrbbbbr","bbrbbbrb","bbrbbbrr","bbrbbrbr","bbrbbrrb","bbrbbrrr","bbrbrbrb","bbrbrrbb","bbrbrrbr","bbrbrrrr","bbrrbrbb","bbrrrbbb","bbrrrbbr","bbrrrbrr","bbrrrrrb","brbbbbrb","brbbbrbb","brbbbrbr","brbbbrrr","brbbrbbr","brbbrbrb","brbbrbrr","brbbrrbr","brbbrrrb","brbbrrrr","brbrbbrb","brbrbrbb","brbrbrbr","brbrbrrr","brbrrbbr","brbrrbrb","brbrrbrr","brbrrrbr","brbrrrrb","brbrrrrr","brrbbrbb","brrbrbbb","brrbrbbr","brrbrbrr","brrbrrrb","brrrbbbr","brrrbbrb","brrrbbrr","brrrbrbr","brrrbrrb","brrrbrrr","brrrrbrb","brrrrrbb","brrrrrbr","brrrrrrr","rbbbbrbb","rbbbrbbb","rbbbrbbr","rbbbrbrr","rbbbrrrb","rbbrbbbr","rbbrbbrb","rbbrbbrr","rbbrbrbr","rbbrbrrb","rbbrbrrr","rbbrrbrb","rbbrrrbb","rbbrrrbr","rbbrrrrr","rbrbbbrb","rbrbbrbb","rbrbbrbr","rbrbbrrr","rbrbrbbr","rbrbrbrb","rbrbrbrr","rbrbrrbr","rbrbrrrb","rbrbrrrr","rbrrbbrb","rbrrbrbb","rbrrbrbr","rbrrbrrr","rbrrrbbr","rbrrrbrb","rbrrrbrr","rbrrrrbr","rbrrrrrb","rbrrrrrr","rrbbbrbb","rrbbrbbb","rrbbrbbr","rrbbrbrr","rrbbrrrb","rrbrbbbr","rrbrbbrb","rrbrbbrr","rrbrbrbr"},
{
"bbbbrbbbb","bbbrbbbbr","bbbrbbbrr","bbbrbbrrb","bbbrbrrbb","bbbrrrbbb","bbrbbbbrb","bbrbbbrbr","bbrbbbrrr","bbrbbrbrb","bbrbbrrbr","bbrbbrrrr","bbrbrbrbb","bbrbrrbbr","bbrbrrbrr","bbrbrrrrb","bbrrbrbbb","bbrrrbbbr","bbrrrbbrr","bbrrrbrrb","bbrrrrrbb","brbbbbrbb","brbbbrbbr","brbbbrbrr","brbbbrrrb","brbbrbbrb","brbbrbrbr","brbbrbrrr","brbbrrbrb","brbbrrrbr","brbbrrrrr","brbrbbrbb","brbrbrbbr","brbrbrbrr","brbrbrrrb","brbrrbbrb","brbrrbrbr","brbrrbrrr","brbrrrbrb","brbrrrrbr","brbrrrrrr","brrbbrbbb","brrbrbbbr","brrbrbbrr","brrbrbrrb","brrbrrrbb","brrrbbbrb","brrrbbrbr","brrrbbrrr","brrrbrbrb","brrrbrrbr","brrrbrrrr","brrrrbrbb","brrrrrbbr","brrrrrbrr","brrrrrrrb","rbbbbrbbb","rbbbrbbbr","rbbbrbbrr","rbbbrbrrb","rbbbrrrbb","rbbrbbbrb","rbbrbbrbr","rbbrbbrrr","rbbrbrbrb","rbbrbrrbr","rbbrbrrrr","rbbrrbrbb","rbbrrrbbr","rbbrrrbrr","rbbrrrrrb","rbrbbbrbb","rbrbbrbbr","rbrbbrbrr","rbrbbrrrb","rbrbrbbrb","rbrbrbrbr","rbrbrbrrr","rbrbrrbrb","rbrbrrrbr","rbrbrrrrr","rbrrbbrbb","rbrrbrbbr","rbrrbrbrr","rbrrbrrrb","rbrrrbbrb","rbrrrbrbr","rbrrrbrrr","rbrrrrbrb","rbrrrrrbr","rbrrrrrrr","rrbbbrbbb","rrbbrbbbr","rrbbrbbrr","rrbbrbrrb","rrbbrrrbb","rrbrbbbrb","rrbrbbrbr","rrbrbbrrr","rrbrbrbrb"},
{
"bbbbbrbbbb","bbbbrbbbbb","bbbbrbbbbr","bbbbrbbbrr","bbbbrbbrrb","bbbbrbrrbb","bbbbrrrbbb","bbbrbbbbbr","bbbrbbbbrb","bbbrbbbbrr","bbbrbbbrbr","bbbrbbbrrb","bbbrbbbrrr","bbbrbbrbrb","bbbrbbrrbb","bbbrbbrrbr","bbbrbbrrrr","bbbrbrbrbb","bbbrbrrbbb","bbbrbrrbbr","bbbrbrrbrr","bbbrbrrrrb","bbbrrbrbbb","bbbrrrbbbb","bbbrrrbbbr","bbbrrrbbrr","bbbrrrbrrb","bbbrrrrrbb","bbrbbbbbrb","bbrbbbbrbb","bbrbbbbrbr","bbrbbbbrrr","bbrbbbrbbr","bbrbbbrbrb","bbrbbbrbrr","bbrbbbrrbr","bbrbbbrrrb","bbrbbbrrrr","bbrbbrbbrb","bbrbbrbrbb","bbrbbrbrbr","bbrbbrbrrr","bbrbbrrbbr","bbrbbrrbrb","bbrbbrrbrr","bbrbbrrrbr","bbrbbrrrrb","bbrbbrrrrr","bbrbrbbrbb","bbrbrbrbbb","bbrbrbrbbr","bbrbrbrbrr","bbrbrbrrrb","bbrbrrbbbr","bbrbrrbbrb","bbrbrrbbrr","bbrbrrbrbr","bbrbrrbrrb","bbrbrrbrrr","bbrbrrrbrb","bbrbrrrrbb","bbrbrrrrbr","bbrbrrrrrr","bbrrbbrbbb","bbrrbrbbbb","bbrrbrbbbr","bbrrbrbbrr","bbrrbrbrrb","bbrrbrrrbb","bbrrrbbbbr","bbrrrbbbrb","bbrrrbbbrr","bbrrrbbrbr","bbrrrbbrrb","bbrrrbbrrr","bbrrrbrbrb","bbrrrbrrbb","bbrrrbrrbr","bbrrrbrrrr","bbrrrrbrbb","bbrrrrrbbb","bbrrrrrbbr","bbrrrrrbrr","bbrrrrrrrb","brbbbbbrbb","brbbbbrbbb","brbbbbrbbr","brbbbbrbrr","brbbbbrrrb","brbbbrbbbr","brbbbrbbrb","brbbbrbbrr","brbbbrbrbr","brbbbrbrrb","brbbbrbrrr","brbbbrrbrb","brbbbrrrbb","brbbbrrrbr","brbbbrrrrr","brbbrbbbrb"},
{
"bbbbbrbbbbb","bbbbrbbbbbr","bbbbrbbbbrr","bbbbrbbbrrb","bbbbrbbrrbb","bbbbrbrrbbb","bbbbrrrbbbb","bbbrbbbbbrb","bbbrbbbbrbr","bbbrbbbbrrr","bbbrbbbrbrb","bbbrbbbrrbr","bbbrbbbrrrr","bbbrbbrbrbb","bbbrbbrrbbr","bbbrbbrrbrr","bbbrbbrrrrb","bbbrbrbrbbb","bbbrbrrbbbr","bbbrbrrbbrr","bbbrbrrbrrb","bbbrbrrrrbb","bbbrrbrbbbb","bbbrrrbbbbr","bbbrrrbbbrr","bbbrrrbbrrb","bbbrrrbrrbb","bbbrrrrrbbb","bbrbbbbbrbb","bbrbbbbrbbr","bbrbbbbrbrr","bbrbbbbrrrb","bbrbbbrbbrb","bbrbbbrbrbr","bbrbbbrbrrr","bbrbbbrrbrb","bbrbbbrrrbr","bbrbbbrrrrr","bbrbbrbbrbb","bbrbbrbrbbr","bbrbbrbrbrr","bbrbbrbrrrb","bbrbbrrbbrb","bbrbbrrbrbr","bbrbbrrbrrr","bbrbbrrrbrb","bbrbbrrrrbr","bbrbbrrrrrr","bbrbrbbrbbb","bbrbrbrbbbr","bbrbrbrbbrr","bbrbrbrbrrb","bbrbrbrrrbb","bbrbrrbbbrb","bbrbrrbbrbr","bbrbrrbbrrr","bbrbrrbrbrb","bbrbrrbrrbr","bbrbrrbrrrr","bbrbrrrbrbb","bbrbrrrrbbr","bbrbrrrrbrr","bbrbrrrrrrb","bbrrbbrbbbb","bbrrbrbbbbr","bbrrbrbbbrr","bbrrbrbbrrb","bbrrbrbrrbb","bbrrbrrrbbb","bbrrrbbbbrb","bbrrrbbbrbr","bbrrrbbbrrr","bbrrrbbrbrb","bbrrrbbrrbr","bbrrrbbrrrr","bbrrrbrbrbb","bbrrrbrrbbr","bbrrrbrrbrr","bbrrrbrrrrb","bbrrrrbrbbb","bbrrrrrbbbr","bbrrrrrbbrr","bbrrrrrbrrb","bbrrrrrrrbb","brbbbbbrbbb","brbbbbrbbbr","brbbbbrbbrr","brbbbbrbrrb","brbbbbrrrbb","brbbbrbbbrb","brbbbrbbrbr","brbbbrbbrrr","brbbbrbrbrb","brbbbrbrrbr","brbbbrbrrrr","brbbbrrbrbb","brbbbrrrbbr","brbbbrrrbrr","brbbbrrrrrb","brbbrbbbrbb"},
{
"bbbbbbrbbbbb","bbbbbrbbbbbb","bbbbbrbbbbbr","bbbbbrbbbbrr","bbbbbrbbbrrb","bbbbbrbbrrbb","bbbbbrbrrbbb","bbbbbrrrbbbb","bbbbrbbbbbbr","bbbbrbbbbbrb","bbbbrbbbbbrr","bbbbrbbbbrbr","bbbbrbbbbrrb","bbbbrbbbbrrr","bbbbrbbbrbrb","bbbbrbbbrrbb","bbbbrbbbrrbr","bbbbrbbbrrrr","bbbbrbbrbrbb","bbbbrbbrrbbb","bbbbrbbrrbbr","bbbbrbbrrbrr","bbbbrbbrrrrb","bbbbrbrbrbbb","bbbbrbrrbbbb","bbbbrbrrbbbr","bbbbrbrrbbrr","bbbbrbrrbrrb","bbbbrbrrrrbb","bbbbrrbrbbbb","bbbbrrrbbbbb","bbbbrrrbbbbr","bbbbrrrbbbrr","bbbbrrrbbrrb","bbbbrrrbrrbb","bbbbrrrrrbbb","bbbrbbbbbbrb","bbbrbbbbbrbb","bbbrbbbbbrbr","bbbrbbbbbrrr","bbbrbbbbrbbr","bbbrbbbbrbrb","bbbrbbbbrbrr","bbbrbbbbrrbr","bbbrbbbbrrrb","bbbrbbbbrrrr","bbbrbbbrbbrb","bbbrbbbrbrbb","bbbrbbbrbrbr","bbbrbbbrbrrr","bbbrbbbrrbbr","bbbrbbbrrbrb","bbbrbbbrrbrr","bbbrbbbrrrbr","bbbrbbbrrrrb","bbbrbbbrrrrr","bbbrbbrbbrbb","bbbrbbrbrbbb","bbbrbbrbrbbr","bbbrbbrbrbrr","bbbrbbrbrrrb","bbbrbbrrbbbr","bbbrbbrrbbrb","bbbrbbrrbbrr","bbbrbbrrbrbr","bbbrbbrrbrrb","bbbrbbrrbrrr","bbbrbbrrrbrb","bbbrbbrrrrbb","bbbrbbrrrrbr","bbbrbbrrrrrr","bbbrbrbbrbbb","bbbrbrbrbbbb","bbbrbrbrbbbr","bbbrbrbrbbrr","bbbrbrbrbrrb","bbbrbrbrrrbb","bbbrbrrbbbbr","bbbrbrrbbbrb","bbbrbrrbbbrr","bbbrbrrbbrbr","bbbrbrrbbrrb","bbbrbrrbbrrr","bbbrbrrbrbrb","bbbrbrrbrrbb","bbbrbrrbrrbr","bbbrbrrbrrrr","bbbrbrrrbrbb","bbbrbrrrrbbb","bbbrbrrrrbbr","bbbrbrrrrbrr","bbbrbrrrrrrb","bbbrrbbrbbbb","bbbrrbrbbbbb","bbbrrbrbbbbr","bbbrrbrbbbrr","bbbrrbrbbrrb","bbbrrbrbrrbb","bbbrrbrrrbbb","bbbrrrbbbbbr"},
{
"bbbbbbrbbbbbb","bbbbbrbbbbbbr","bbbbbrbbbbbrr","bbbbbrbbbbrrb","bbbbbrbbbrrbb","bbbbbrbbrrbbb","bbbbbrbrrbbbb","bbbbbrrrbbbbb","bbbbrbbbbbbrb","bbbbrbbbbbrbr","bbbbrbbbbbrrr","bbbbrbbbbrbrb","bbbbrbbbbrrbr","bbbbrbbbbrrrr","bbbbrbbbrbrbb","bbbbrbbbrrbbr","bbbbrbbbrrbrr","bbbbrbbbrrrrb","bbbbrbbrbrbbb","bbbbrbbrrbbbr","bbbbrbbrrbbrr","bbbbrbbrrbrrb","bbbbrbbrrrrbb","bbbbrbrbrbbbb","bbbbrbrrbbbbr","bbbbrbrrbbbrr","bbbbrbrrbbrrb","bbbbrbrrbrrbb","bbbbrbrrrrbbb","bbbbrrbrbbbbb","bbbbrrrbbbbbr","bbbbrrrbbbbrr","bbbbrrrbbbrrb","bbbbrrrbbrrbb","bbbbrrrbrrbbb","bbbbrrrrrbbbb","bbbrbbbbbbrbb","bbbrbbbbbrbbr","bbbrbbbbbrbrr","bbbrbbbbbrrrb","bbbrbbbbrbbrb","bbbrbbbbrbrbr","bbbrbbbbrbrrr","bbbrbbbbrrbrb","bbbrbbbbrrrbr","bbbrbbbbrrrrr","bbbrbbbrbbrbb","bbbrbbbrbrbbr","bbbrbbbrbrbrr","bbbrbbbrbrrrb","bbbrbbbrrbbrb","bbbrbbbrrbrbr","bbbrbbbrrbrrr","bbbrbbbrrrbrb","bbbrbbbrrrrbr","bbbrbbbrrrrrr","bbbrbbrbbrbbb","bbbrbbrbrbbbr","bbbrbbrbrbbrr","bbbrbbrbrbrrb","bbbrbbrbrrrbb","bbbrbbrrbbbrb","bbbrbbrrbbrbr","bbbrbbrrbbrrr","bbbrbbrrbrbrb","bbbrbbrrbrrbr","bbbrbbrrbrrrr","bbbrbbrrrbrbb","bbbrbbrrrrbbr","bbbrbbrrrrbrr","bbbrbbrrrrrrb","bbbrbrbbrbbbb","bbbrbrbrbbbbr","bbbrbrbrbbbrr","bbbrbrbrbbrrb","bbbrbrbrbrrbb","bbbrbrbrrrbbb","bbbrbrrbbbbrb","bbbrbrrbbbrbr","bbbrbrrbbbrrr","bbbrbrrbbrbrb","bbbrbrrbbrrbr","bbbrbrrbbrrrr","bbbrbrrbrbrbb","bbbrbrrbrrbbr","bbbrbrrbrrbrr","bbbrbrrbrrrrb","bbbrbrrrbrbbb","bbbrbrrrrbbbr","bbbrbrrrrbbrr","bbbrbrrrrbrrb","bbbrbrrrrrrbb","bbbrrbbrbbbbb","bbbrrbrbbbbbr","bbbrrbrbbbbrr","bbbrrbrbbbrrb","bbbrrbrbbrrbb","bbbrrbrbrrbbb","bbbrrbrrrbbbb","bbbrrrbbbbbrb"},
{
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{
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{
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"bbbbbbbbbbbbbrbbbbbbbbbbbbb","bbbbbbbbbbbbrbbbbbbbbbbbbbr","bbbbbbbbbbbbrbbbbbbbbbbbbrr","bbbbbbbbbbbbrbbbbbbbbbbbrrb","bbbbbbbbbbbbrbbbbbbbbbbrrbb","bbbbbbbbbbbbrbbbbbbbbbrrbbb","bbbbbbbbbbbbrbbbbbbbbrrbbbb","bbbbbbbbbbbbrbbbbbbbrrbbbbb","bbbbbbbbbbbbrbbbbbbrrbbbbbb","bbbbbbbbbbbbrbbbbbrrbbbbbbb","bbbbbbbbbbbbrbbbbrrbbbbbbbb","bbbbbbbbbbbbrbbbrrbbbbbbbbb","bbbbbbbbbbbbrbbrrbbbbbbbbbb","bbbbbbbbbbbbrbrrbbbbbbbbbbb","bbbbbbbbbbbbrrrbbbbbbbbbbbb","bbbbbbbbbbbrbbbbbbbbbbbbbrb","bbbbbbbbbbbrbbbbbbbbbbbbrbr","bbbbbbbbbbbrbbbbbbbbbbbbrrr","bbbbbbbbbbbrbbbbbbbbbbbrbrb","bbbbbbbbbbbrbbbbbbbbbbbrrbr","bbbbbbbbbbbrbbbbbbbbbbbrrrr","bbbbbbbbbbbrbbbbbbbbbbrbrbb","bbbbbbbbbbbrbbbbbbbbbbrrbbr","bbbbbbbbbbbrbbbbbbbbbbrrbrr","bbbbbbbbbbbrbbbbbbbbbbrrrrb","bbbbbbbbbbbrbbbbbbbbbrbrbbb","bbbbbbbbbbbrbbbbbbbbbrrbbbr","bbbbbbbbbbbrbbbbbbbbbrrbbrr","bbbbbbbbbbbrbbbbbbbbbrrbrrb","bbbbbbbbbbbrbbbbbbbbbrrrrbb","bbbbbbbbbbbrbbbbbbbbrbrbbbb","bbbbbbbbbbbrbbbbbbbbrrbbbbr","bbbbbbbbbbbrbbbbbbbbrrbbbrr","bbbbbbbbbbbrbbbbbbbbrrbbrrb","bbbbbbbbbbbrbbbbbbbbrrbrrbb","bbbbbbbbbbbrbbbbbbbbrrrrbbb","bbbbbbbbbbbrbbbbbbbrbrbbbbb","bbbbbbbbbbbrbbbbbbbrrbbbbbr","bbbbbbbbbbbrbbbbbbbrrbbbbrr","bbbbbbbbbbbrbbbbbbbrrbbbrrb","bbbbbbbbbbbrbbbbbbbrrbbrrbb","bbbbbbbbbbbrbbbbbbbrrbrrbbb","bbbbbbbbbbbrbbbbbbbrrrrbbbb","bbbbbbbbbbbrbbbbbbrbrbbbbbb","bbbbbbbbbbbrbbbbbbrrbbbbbbr","bbbbbbbbbbbrbbbbbbrrbbbbbrr","bbbbbbbbbbbrbbbbbbrrbbbbrrb","bbbbbbbbbbbrbbbbbbrrbbbrrbb","bbbbbbbbbbbrbbbbbbrrbbrrbbb","bbbbbbbbbbbrbbbbbbrrbrrbbbb","bbbbbbbbbbbrbbbbbbrrrrbbbbb","bbbbbbbbbbbrbbbbbrbrbbbbbbb","bbbbbbbbbbbrbbbbbrrbbbbbbbr","bbbbbbbbbbbrbbbbbrrbbbbbbrr","bbbbbbbbbbbrbbbbbrrbbbbbrrb","bbbbbbbbbbbrbbbbbrrbbbbrrbb","bbbbbbbbbbbrbbbbbrrbbbrrbbb","bbbbbbbbbbbrbbbbbrrbbrrbbbb","bbbbbbbbbbbrbbbbbrrbrrbbbbb","bbbbbbbbbbbrbbbbbrrrrbbbbbb","bbbbbbbbbbbrbbbbrbrbbbbbbbb","bbbbbbbbbbbrbbbbrrbbbbbbbbr","bbbbbbbbbbbrbbbbrrbbbbbbbrr","bbbbbbbbbbbrbbbbrrbbbbbbrrb","bbbbbbbbbbbrbbbbrrbbbbbrrbb","bbbbbbbbbbbrbbbbrrbbbbrrbbb","bbbbbbbbbbbrbbbbrrbbbrrbbbb","bbbbbbbbbbbrbbbbrrbbrrbbbbb","bbbbbbbbbbbrbbbbrrbrrbbbbbb","bbbbbbbbbbbrbbbbrrrrbbbbbbb","bbbbbbbbbbbrbbbrbrbbbbbbbbb","bbbbbbbbbbbrbbbrrbbbbbbbbbr","bbbbbbbbbbbrbbbrrbbbbbbbbrr","bbbbbbbbbbbrbbbrrbbbbbbbrrb","bbbbbbbbbbbrbbbrrbbbbbbrrbb","bbbbbbbbbbbrbbbrrbbbbbrrbbb","bbbbbbbbbbbrbbbrrbbbbrrbbbb","bbbbbbbbbbbrbbbrrbbbrrbbbbb","bbbbbbbbbbbrbbbrrbbrrbbbbbb","bbbbbbbbbbbrbbbrrbrrbbbbbbb","bbbbbbbbbbbrbbbrrrrbbbbbbbb","bbbbbbbbbbbrbbrbrbbbbbbbbbb","bbbbbbbbbbbrbbrrbbbbbbbbbbr","bbbbbbbbbbbrbbrrbbbbbbbbbrr","bbbbbbbbbbbrbbrrbbbbbbbbrrb","bbbbbbbbbbbrbbrrbbbbbbbrrbb","bbbbbbbbbbbrbbrrbbbbbbrrbbb","bbbbbbbbbbbrbbrrbbbbbrrbbbb","bbbbbbbbbbbrbbrrbbbbrrbbbbb","bbbbbbbbbbbrbbrrbbbrrbbbbbb","bbbbbbbbbbbrbbrrbbrrbbbbbbb","bbbbbbbbbbbrbbrrbrrbbbbbbbb","bbbbbbbbbbbrbbrrrrbbbbbbbbb","bbbbbbbbbbbrbrbrbbbbbbbbbbb","bbbbbbbbbbbrbrrbbbbbbbbbbbr","bbbbbbbbbbbrbrrbbbbbbbbbbrr","bbbbbbbbbbbrbrrbbbbbbbbbrrb","bbbbbbbbbbbrbrrbbbbbbbbrrbb","bbbbbbbbbbbrbrrbbbbbbbrrbbb","bbbbbbbbbbbrbrrbbbbbbrrbbbb"},
{
"bbbbbbbbbbbbbbrbbbbbbbbbbbbb","bbbbbbbbbbbbbrbbbbbbbbbbbbbb","bbbbbbbbbbbbbrbbbbbbbbbbbbbr","bbbbbbbbbbbbbrbbbbbbbbbbbbrr","bbbbbbbbbbbbbrbbbbbbbbbbbrrb","bbbbbbbbbbbbbrbbbbbbbbbbrrbb","bbbbbbbbbbbbbrbbbbbbbbbrrbbb","bbbbbbbbbbbbbrbbbbbbbbrrbbbb","bbbbbbbbbbbbbrbbbbbbbrrbbbbb","bbbbbbbbbbbbbrbbbbbbrrbbbbbb","bbbbbbbbbbbbbrbbbbbrrbbbbbbb","bbbbbbbbbbbbbrbbbbrrbbbbbbbb","bbbbbbbbbbbbbrbbbrrbbbbbbbbb","bbbbbbbbbbbbbrbbrrbbbbbbbbbb","bbbbbbbbbbbbbrbrrbbbbbbbbbbb","bbbbbbbbbbbbbrrrbbbbbbbbbbbb","bbbbbbbbbbbbrbbbbbbbbbbbbbbr","bbbbbbbbbbbbrbbbbbbbbbbbbbrb","bbbbbbbbbbbbrbbbbbbbbbbbbbrr","bbbbbbbbbbbbrbbbbbbbbbbbbrbr","bbbbbbbbbbbbrbbbbbbbbbbbbrrb","bbbbbbbbbbbbrbbbbbbbbbbbbrrr","bbbbbbbbbbbbrbbbbbbbbbbbrbrb","bbbbbbbbbbbbrbbbbbbbbbbbrrbb","bbbbbbbbbbbbrbbbbbbbbbbbrrbr","bbbbbbbbbbbbrbbbbbbbbbbbrrrr","bbbbbbbbbbbbrbbbbbbbbbbrbrbb","bbbbbbbbbbbbrbbbbbbbbbbrrbbb","bbbbbbbbbbbbrbbbbbbbbbbrrbbr","bbbbbbbbbbbbrbbbbbbbbbbrrbrr","bbbbbbbbbbbbrbbbbbbbbbbrrrrb","bbbbbbbbbbbbrbbbbbbbbbrbrbbb","bbbbbbbbbbbbrbbbbbbbbbrrbbbb","bbbbbbbbbbbbrbbbbbbbbbrrbbbr","bbbbbbbbbbbbrbbbbbbbbbrrbbrr","bbbbbbbbbbbbrbbbbbbbbbrrbrrb","bbbbbbbbbbbbrbbbbbbbbbrrrrbb","bbbbbbbbbbbbrbbbbbbbbrbrbbbb","bbbbbbbbbbbbrbbbbbbbbrrbbbbb","bbbbbbbbbbbbrbbbbbbbbrrbbbbr","bbbbbbbbbbbbrbbbbbbbbrrbbbrr","bbbbbbbbbbbbrbbbbbbbbrrbbrrb","bbbbbbbbbbbbrbbbbbbbbrrbrrbb","bbbbbbbbbbbbrbbbbbbbbrrrrbbb","bbbbbbbbbbbbrbbbbbbbrbrbbbbb","bbbbbbbbbbbbrbbbbbbbrrbbbbbb","bbbbbbbbbbbbrbbbbbbbrrbbbbbr","bbbbbbbbbbbbrbbbbbbbrrbbbbrr","bbbbbbbbbbbbrbbbbbbbrrbbbrrb","bbbbbbbbbbbbrbbbbbbbrrbbrrbb","bbbbbbbbbbbbrbbbbbbbrrbrrbbb","bbbbbbbbbbbbrbbbbbbbrrrrbbbb","bbbbbbbbbbbbrbbbbbbrbrbbbbbb","bbbbbbbbbbbbrbbbbbbrrbbbbbbb","bbbbbbbbbbbbrbbbbbbrrbbbbbbr","bbbbbbbbbbbbrbbbbbbrrbbbbbrr","bbbbbbbbbbbbrbbbbbbrrbbbbrrb","bbbbbbbbbbbbrbbbbbbrrbbbrrbb","bbbbbbbbbbbbrbbbbbbrrbbrrbbb","bbbbbbbbbbbbrbbbbbbrrbrrbbbb","bbbbbbbbbbbbrbbbbbbrrrrbbbbb","bbbbbbbbbbbbrbbbbbrbrbbbbbbb","bbbbbbbbbbbbrbbbbbrrbbbbbbbb","bbbbbbbbbbbbrbbbbbrrbbbbbbbr","bbbbbbbbbbbbrbbbbbrrbbbbbbrr","bbbbbbbbbbbbrbbbbbrrbbbbbrrb","bbbbbbbbbbbbrbbbbbrrbbbbrrbb","bbbbbbbbbbbbrbbbbbrrbbbrrbbb","bbbbbbbbbbbbrbbbbbrrbbrrbbbb","bbbbbbbbbbbbrbbbbbrrbrrbbbbb","bbbbbbbbbbbbrbbbbbrrrrbbbbbb","bbbbbbbbbbbbrbbbbrbrbbbbbbbb","bbbbbbbbbbbbrbbbbrrbbbbbbbbb","bbbbbbbbbbbbrbbbbrrbbbbbbbbr","bbbbbbbbbbbbrbbbbrrbbbbbbbrr","bbbbbbbbbbbbrbbbbrrbbbbbbrrb","bbbbbbbbbbbbrbbbbrrbbbbbrrbb","bbbbbbbbbbbbrbbbbrrbbbbrrbbb","bbbbbbbbbbbbrbbbbrrbbbrrbbbb","bbbbbbbbbbbbrbbbbrrbbrrbbbbb","bbbbbbbbbbbbrbbbbrrbrrbbbbbb","bbbbbbbbbbbbrbbbbrrrrbbbbbbb","bbbbbbbbbbbbrbbbrbrbbbbbbbbb","bbbbbbbbbbbbrbbbrrbbbbbbbbbb","bbbbbbbbbbbbrbbbrrbbbbbbbbbr","bbbbbbbbbbbbrbbbrrbbbbbbbbrr","bbbbbbbbbbbbrbbbrrbbbbbbbrrb","bbbbbbbbbbbbrbbbrrbbbbbbrrbb","bbbbbbbbbbbbrbbbrrbbbbbrrbbb","bbbbbbbbbbbbrbbbrrbbbbrrbbbb","bbbbbbbbbbbbrbbbrrbbbrrbbbbb","bbbbbbbbbbbbrbbbrrbbrrbbbbbb","bbbbbbbbbbbbrbbbrrbrrbbbbbbb","bbbbbbbbbbbbrbbbrrrrbbbbbbbb","bbbbbbbbbbbbrbbrbrbbbbbbbbbb","bbbbbbbbbbbbrbbrrbbbbbbbbbbb","bbbbbbbbbbbbrbbrrbbbbbbbbbbr","bbbbbbbbbbbbrbbrrbbbbbbbbbrr","bbbbbbbbbbbbrbbrrbbbbbbbbrrb","bbbbbbbbbbbbrbbrrbbbbbbbrrbb"}};
void cal(ll n){
ll res = 0;
for(ll i = 1;i <= n;i += 2){
res += n - i + 1;
}
cout<<res<<'\n';
}
string ji[100] = {
"bbbbbbbbbbbbrb","bbbbbbbbbbbrbr","bbbbbbbbbbbrrr","bbbbbbbbbbrbrb","bbbbbbbbbbrrbr","bbbbbbbbbbrrrr","bbbbbbbbbrbrbb","bbbbbbbbbrrbbr","bbbbbbbbbrrbrr","bbbbbbbbbrrrrb","bbbbbbbbrbrbbb","bbbbbbbbrrbbbr","bbbbbbbbrrbbrr","bbbbbbbbrrbrrb","bbbbbbbbrrrrbb","bbbbbbbrbrbbbb","bbbbbbbrrbbbbr","bbbbbbbrrbbbrr","bbbbbbbrrbbrrb","bbbbbbbrrbrrbb","bbbbbbbrrrrbbb","bbbbbbrbrbbbbb","bbbbbbrrbbbbbr","bbbbbbrrbbbbrr","bbbbbbrrbbbrrb","bbbbbbrrbbrrbb","bbbbbbrrbrrbbb","bbbbbbrrrrbbbb","bbbbbrbrbbbbbb","bbbbbrrbbbbbbr","bbbbbrrbbbbbrr","bbbbbrrbbbbrrb","bbbbbrrbbbrrbb","bbbbbrrbbrrbbb","bbbbbrrbrrbbbb","bbbbbrrrrbbbbb","bbbbrbrbbbbbbb","bbbbrrbbbbbbbr","bbbbrrbbbbbbrr","bbbbrrbbbbbrrb","bbbbrrbbbbrrbb","bbbbrrbbbrrbbb","bbbbrrbbrrbbbb","bbbbrrbrrbbbbb","bbbbrrrrbbbbbb","bbbrbrbbbbbbbb","bbbrrbbbbbbbbr","bbbrrbbbbbbbrr","bbbrrbbbbbbrrb","bbbrrbbbbbrrbb","bbbrrbbbbrrbbb","bbbrrbbbrrbbbb","bbbrrbbrrbbbbb","bbbrrbrrbbbbbb","bbbrrrrbbbbbbb","bbrbrbbbbbbbbb","bbrrbbbbbbbbbr","bbrrbbbbbbbbrr","bbrrbbbbbbbrrb","bbrrbbbbbbrrbb","bbrrbbbbbrrbbb","bbrrbbbbrrbbbb","bbrrbbbrrbbbbb","bbrrbbrrbbbbbb","bbrrbrrbbbbbbb","bbrrrrbbbbbbbb","brbrbbbbbbbbbb","brrbbbbbbbbbbr","brrbbbbbbbbbrr","brrbbbbbbbbrrb","brrbbbbbbbrrbb","brrbbbbbbrrbbb","brrbbbbbrrbbbb","brrbbbbrrbbbbb","brrbbbrrbbbbbb","brrbbrrbbbbbbb","brrbrrbbbbbbbb","brrrrbbbbbbbbb","rbrbbbbbbbbbbb","rrbbbbbbbbbbbr","rrbbbbbbbbbbrr","rrbbbbbbbbbrrb","rrbbbbbbbbrrbb","rrbbbbbbbrrbbb"};
string ou[100] = {
"bbbbbbbbbbbbbbr","bbbbbbbbbbbbbrb","bbbbbbbbbbbbbrr","bbbbbbbbbbbbrbr","bbbbbbbbbbbbrrb","bbbbbbbbbbbbrrr","bbbbbbbbbbbrbrb","bbbbbbbbbbbrrbb","bbbbbbbbbbbrrbr","bbbbbbbbbbbrrrr","bbbbbbbbbbrbrbb","bbbbbbbbbbrrbbb","bbbbbbbbbbrrbbr","bbbbbbbbbbrrbrr","bbbbbbbbbbrrrrb","bbbbbbbbbrbrbbb","bbbbbbbbbrrbbbb","bbbbbbbbbrrbbbr","bbbbbbbbbrrbbrr","bbbbbbbbbrrbrrb","bbbbbbbbbrrrrbb","bbbbbbbbrbrbbbb","bbbbbbbbrrbbbbb","bbbbbbbbrrbbbbr","bbbbbbbbrrbbbrr","bbbbbbbbrrbbrrb","bbbbbbbbrrbrrbb","bbbbbbbbrrrrbbb","bbbbbbbrbrbbbbb","bbbbbbbrrbbbbbb","bbbbbbbrrbbbbbr","bbbbbbbrrbbbbrr","bbbbbbbrrbbbrrb","bbbbbbbrrbbrrbb","bbbbbbbrrbrrbbb","bbbbbbbrrrrbbbb","bbbbbbrbrbbbbbb","bbbbbbrrbbbbbbb","bbbbbbrrbbbbbbr","bbbbbbrrbbbbbrr","bbbbbbrrbbbbrrb","bbbbbbrrbbbrrbb","bbbbbbrrbbrrbbb","bbbbbbrrbrrbbbb","bbbbbbrrrrbbbbb","bbbbbrbrbbbbbbb","bbbbbrrbbbbbbbb","bbbbbrrbbbbbbbr","bbbbbrrbbbbbbrr","bbbbbrrbbbbbrrb","bbbbbrrbbbbrrbb","bbbbbrrbbbrrbbb","bbbbbrrbbrrbbbb","bbbbbrrbrrbbbbb","bbbbbrrrrbbbbbb","bbbbrbrbbbbbbbb","bbbbrrbbbbbbbbb","bbbbrrbbbbbbbbr","bbbbrrbbbbbbbrr","bbbbrrbbbbbbrrb","bbbbrrbbbbbrrbb","bbbbrrbbbbrrbbb","bbbbrrbbbrrbbbb","bbbbrrbbrrbbbbb","bbbbrrbrrbbbbbb","bbbbrrrrbbbbbbb","bbbrbrbbbbbbbbb","bbbrrbbbbbbbbbb","bbbrrbbbbbbbbbr","bbbrrbbbbbbbbrr","bbbrrbbbbbbbrrb","bbbrrbbbbbbrrbb","bbbrrbbbbbrrbbb","bbbrrbbbbrrbbbb","bbbrrbbbrrbbbbb","bbbrrbbrrbbbbbb","bbbrrbrrbbbbbbb","bbbrrrrbbbbbbbb","bbrbrbbbbbbbbbb","bbrrbbbbbbbbbbb","bbrrbbbbbbbbbbr","bbrrbbbbbbbbbrr","bbrrbbbbbbbbrrb"};
int www[28] = {
1,3,3,10,10,35,35,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100,100};
int main()
{
//freopen("ans.txt","w",stdout);
//scanf("%lld\n",&n);
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n;
cal(n);
if(n <= 28){
for(int i = 0;i < www[n - 1];i ++){
cout<<sans[n - 1][i]<<'\n';
}
}else{
for(int i = 1;i <= n;i ++){
if(i == n / 2 + 1) cout<<'r';
else cout<<'b';
}
cout<<'\n';
if(n % 2 == 0){
for(int i = 1;i <= n;i ++){
if(i == n / 2) cout<<'r';
else cout<<'b';
}
cout<<'\n';
}
for(int i = 1;i < n;i ++){
if(i == n / 2) cout<<'r';
else cout<<'b';
}cout<<'r';
cout<<'\n';
int now = n - 1;
int wpc = 2;
if(n % 2 == 0) wpc ++;
while(now != n / 2){
wpc ++;
for(int i = 1;i <= n;i ++){
if(i == n / 2) cout<<'r';
else if(i == now){
i ++;
cout<<"rr";
}else cout<<'b';
}
now --;
cout<<'\n';
if(wpc == 100) return 0;
}
int x = 0;
while(1){
wpc ++;
if(n & 1)
for(int i = 1;i <= n - 14;i ++){
if(i == n / 2 - 1) cout<<'r';
else cout<<'b';
}
else
for(int i = 1;i <= n - 15;i ++){
if(i == n / 2 - 1) cout<<'r';
else cout<<'b';
}
if(n & 1)
cout<<ji[x ++]<<'\n';
else cout<<ou[x ++]<<'\n';
//cout<<wpc<<'\n';
if(wpc == 100) return 0;
}
}
return 0;
}