// editor1
#include<iostream>
using namesspace std;
void printAlphabetTraingle(int height){
    if (height<1|| height>26){
        return;
    }
    for (int i=1;i<=height;i++ ){
        char ch ='A'
        for {jnt j=1;j<=i;j++){
            cout<<ch<<" ";
            ch++;
        }
        cout<<endl;
    }
}
int main(){
    int height;
    cin>>height;
    printAlphabetTraingle(height);
    return 0;
}