#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,i,j;
	char b='A',a[15][15];
	cin>>n;
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			a[i][j]=b+j;
		}
		b++;
	}
	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: Wrong Answer
****************************************************************/