#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,now = int('A');
	cin >> n;
	for (int i = 1;i <= n * n;i++){
		if (now > 'Z'){
			now = int('A');
		}
		cout << char(now);
		if (i % n == 0){
			cout << endl;
		}
		now++;
	}
    return 0;
}