// editor5
#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++){
        for(char ch=' A ';ch<' A '+i;ch++){
            cout<<ch;
        }
        cout<<endl;
    }
    return 0;
}