#include <iostream>
using namespace std;
int main(){
string zm = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int a,b = 1;
cin>>a;
int c = 0;
for (int i = 0;i<a;i++){
	cout<<zm[c];
	for (int j = 1;j<a;j++,b++){
		if(b>25){
			b = 0;
		}
		cout<<zm[b];
		
	}
	cout<<endl;
	c++;
	b = i+2;
}
	return 0;
}