#include<iostream>
using namespace std;
int main(){
    int  height;
    cin>>height;
    if(height<1||height>26){cout<<"Invalid input";
    return 0;
    }
    for(int i=1;i<=height,i++){
        char ch="A";
        for(intj=1;i<=i;j++){
            cout<<ch<<"";
        }
        cout<<endl;
    }
    return 0;
}