using System;

public class Program

{

    public static void Main()

     {

            {

            int num;

            Console.Write("Enter A Number : ");

            num = Convert.ToInt32(Console.ReadLine());

​

            for (int i = 1; i <= num; i++)

            {

                char ch = 'A';

                for (int j = 1; j <= i; j++)

                {

                    Console.Write(ch + "");

                    ch++;

                }

​

​

                Console.WriteLine();

            }

            }}}

​