#include<bits/stdc++.h>
using namespace std;

int main() {
	long long n;
	cin>> n;
	char a = 'A';
	char cur = a;
	for(int i = 1; i <= n; i++) {
		cur = a;
		for (int j = 1; j <= n; j++) {
			cout << cur;
			cur += 1;
		}
		cout << endl;
		a += 1;
	}
	return 0;
}