P04.java

import java.util.*;
public class P04 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        for(int i = 0 ; i < n ; i ++){
            for (int j = 0 ; j <= i ; j++){
                System.out.print((char)(65+i)+" ");
            }
            System.out.println();
        }
    }
}