#include<iostream>
using namespace std;
int main() 
{
	int n ;
	char a ='A';
	cin> > n ;
	for(int i=1;i<= n;++i)
	{
		for(int j=1;j<=i;++j) 
		{
			if(a =='Z'+1)
			{
				a ='A';
			}
			cout << a;
			++a;
		}
		cout << endl;
	}
}