#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	n+=64;
	for(char i='A';i<=n;i++){
		for(int j='A';j<=n;j++){
			cout<<i;
		}
		cout<<endl;
	}
}
/**************************************************************
	Problem: 1974
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/