// editor2
#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(int j=1;j<=i;j++){
            cout<<ch<<" ";
            ch++;
        }
        cout<<endl;
    }
    return 0;
}