#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int a[20][20];
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(i+j<=n-1) a[i][j]=i+j+1+64;
			else a[i][j]=(i+j)-n+1+64; 
		}
	} 
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			cout<<setw(3)<<(char)a[i][j];
		}
		cout<<endl;
	}
	return 0;
}

/**************************************************************
	Problem: 1194
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/