#include <iostream>
using namespace std;

int main() {
    cout << "Enter Row Input : " ;
    int n;
    cin >> n;
    cout << endl;
    
    int row = 1;

    while(row <= n){
        int col = 1;
        char ch = 'A' + row - 1;
        while(col <= row){
            cout << ch << " ";
            col += 1;
            ch += 1;
        }
        // while(col <= row){
        //     char ch = 'A' + row + col - 2;
        //     cout << ch << " ";
        //     col += 1;
        // }
        cout << endl;
        row += 1;
    }
    
}