#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,a[100][100];
	cin>>n;
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(i+j<=n-1){
				a[i][j]=i+j+65;
			}
			else{
				a[i][j]=i+j-n+65;
			}
		}
	}
	for(int i=0;i<=n-1;i++){
		for(int j=0;j<=n-1;j++){
			cout<<setw(3)<<(char)a[i][j];
			}	
		cout<<endl;
		}
	return 0;
}
/**************************************************************
	Problem: 1194
	User: Teio
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/