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