#include <iostream>
    using namespace std;

int main() {
    int x;
    cout<<" enter rows  : "<<endl;
    cin>>x;
    
    for(int i = 1 ; i<=x; i++){
        for ( int j = 1 ; j<=i ; j++){
            cout<<(char)(j+64)<<" ";
        }
        cout<<endl;
    }
}