mithilesh kumar singh

class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Enter the row number");

            int n = int.Parse(Console.ReadLine());

            for (int row = 1; row <= n; row++)

            {

                for (int coll = 1; coll <= row; coll++)

                {

                    Console.Write(Convert.ToChar(row));

                }

                Console.WriteLine();

            }

                       

            Console.ReadLine();

        }

    }