#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,j,i;
	char a[10][10]={0};
	cin>>n;
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			if(i+j<n){
				a[i][j]=65+i+j;
			}else{
				a[i][j]=60+i+j;
			}
		}	
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			cout<<setw(3)<<a[i][j];
		}cout<<endl;	
	}
}
/**************************************************************
	Problem: 1194
	User: chenjiahui
	Language: C++
	Result: Wrong Answer
****************************************************************/