using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine("*");

            Console.WriteLine("**");

            Console.WriteLine("***");

            Console.WriteLine("****");

            Console.WriteLine("*****");

            Console.WriteLine("******");

            Console.WriteLine("*******");

            Console.WriteLine("********");

            Console.WriteLine("*********");

            Console.WriteLine("**********");

    }

}

​