#include<bits/stdc++.h>
using namespace std;
int a[200][200];
int n,c=1;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
        	if(i+j<=n+1){
        		a[i][j]=i+j-1;
			}
        	else{
        		a[i][j]=i+j-n-1;
			}	
            
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
                cout<<setw(3)<<char(a[i][j]+64); 
        }
        cout<<endl;
    }
    return 0;
}
/**************************************************************
	Problem: 1194
	User: xuanhua
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2228 kb
****************************************************************/