#include<iostream>
using namespace std;
int main(){
    int height;
    cin>>height ;
   
    
    for(int i=0;i<height;++i)
        for(int j=0;j<=i;++j){
            cout<<static_cast<char>('A'+j)<<" " ;
         
        }
        cout<<endl;
        
    }
    return 0;
    }