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


int main(){
	int n;
	cin>>n;
	for(int i = 1;i <= n;i++){
		for(int j = 1;j <= n;j++){
			cout<<(char)(j+64);
		}
		cout<<endl;
	}
}


/**************************************************************
	Problem: 1975
	User: admin
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/