Cattle off network PubMed complex questions - Anti-order output

Topic Address: https://www.nowcoder.com/practice/171278d170c64d998ab342b3b40171bb?tpId=40&tqId=21336&tPage=1&rp=1&ru=%2Fta%2Fkaoyan&qru=%2Fta%2Fkaoyan%2Fquestion-ranking

Solution: None

 1 #include<iostream>
 2 using namespace std;
 3 int main(){
 4     char a[4];
 5     while(cin>>a){
 6         for(int i=3;i>=0;i--){
 7             cout<<a[i];
 8         }
 9         cout<<endl;
10     }
11     return 0;
12 }