#include<bits/stdc++.h>
using namespace std;
int n; char c=64;
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        c=c=='Z'?'A':c+1;
        for(int j=0;j<n;j++)
          printf("%c",(c+j>'Z'?c+j-26:c));
        printf("\n");
    }
    return 0;
}