#include<bits/stdc++.h>
using namespace std;
int a[11][11],n,i,j,p;
char k='A',l='A';
int main(){
	cin>>n;
	p=n;
	for(i=0;i<n;i++){
		l=k;
		for(j=0;j<p;j++){
			a[i][j]=l++;
		}
		l='A';
		for(j=p;j<n;j++){
			a[i][j]=l++;
		}
		k++;
		p--;
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			cout<<setw(3)<<char(a[i][j]);
		}
		cout<<endl;
	}
	return 0;
}
/**************************************************************
	Problem: 1194
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/