#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i,j;
	cin>>n;
	for(i=0;i<n;i++){
		for(j=0;j<=i;j++) cout<<char(i+65);
		cout<<endl;
	} 
return 0;}

/**************************************************************
	Problem: 1977
	User: fzy001
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/