#include<bits/stdc++.h>
using namespace std;
int main(){
    int a[10][10];
    int i,j,n;
    cin>>n;
    for(i=0;i<n;i++){
        for(j=0;j<n;j++){
            if(i+j+1<=n) a[i][j]=i+j+1+64;
            else a[i][j]=i+j+1-n+64;
        }
    }
    for(i=0;i<n;i++){
        for(j=0;j<n;j++) cout<<setw(3)<<char(a[i][j]);
        cout<<endl;
    }
}
/**************************************************************
	Problem: 1194
	User: wngjinming
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/