#include<bits/stdc++.h>
using namespace std;
int n,a[10][10],z; 
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+64;	
			else a[i][j]=i+j-1-n+64;
		}	
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			cout<<setw(3)<<(char)a[i][j];	
		}
		cout<<endl;	
	}
	return 0;
}

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