Description
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main()
{
char c;
int q=1;
while((c=getchar())!=EOF)
{
if(c == '"')
{
printf(q ? "``":"''");
q = !q;
}
else
printf("%c",c);
}
return 0;
}