#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <cstdio>
#include <iomanip>
#include <map>
#include <queue>
#include <set>
#define ll long long
using namespace std;
int main()
{
	int n;
	cin >> n;
	int i,j;
	char a = 'A';
	for(i = 1;i <= n;i++)
	{
		for(j = 1;j <= n;j++)
		{
			cout << a;
			if(a == 'Z')
			{
				a = 'A';
			}
			a++;
		}
		a -= n - 1;
		cout << endl;
		if(a >= 'Z')
		{
			a = 'A';
		}
	}
	return 0;	
}