using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

  // what will the output be?

  // update the code to execute DoStuff methods asynchronously

  // what do you think the output will be now?

​

  public static void Main(string[] args)

  {

    var one = DoStuff1();

    var two = DoStuff2();

    var three = DoStuff3();

​

    Console.WriteLine($"{one}, {two}, {three}");

    Console.ReadLine();

  }

​

  static int DoStuff1()

  {

    Thread.Sleep(10000);

    Console.WriteLine("1");

    return 1;

  }

​

  static int DoStuff2()

  {

    Thread.Sleep(5000);

    Console.WriteLine("2");

    return 2;

  }

​

  static int DoStuff3()

  {

    Thread.Sleep(1000);

    Console.WriteLine("3");

    return 3;

  }

}