#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,j,n; 
	char a[15][15]={0};
	cin>>n;
	for(i=n-1;i>=0;i--){
		for(j=0;j<n;j++){
			if(i+j>n-1){
				a[j][i]=65+j+i-n;
			}else{
				a[j][i]=65+j+i;
			}
			
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			cout<<setw(3)<<a[i][j];
		}
		cout<<endl;
	}
	
}


/**************************************************************
	Problem: 1194
	User: 15159808820
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/