using System;

using System.Collections.Generic;

using System.Linq;                  

public class Program

{

    public static void Main()

    {

        List<string> abc=new List<string>() {"301","301b","301a","300","302"};

        Console.WriteLine("Hello World {0}",string.Join("|",abc.OrderBy(x=>x).ToList()));

    }

}