using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

​

        Console.WriteLine("#"+GetWebProcessSourceEnvironment()+"#");

    }

    public static string WebProcessSourceEnvironment = "CH   ,     NULL";

            public static string GetWebProcessSourceEnvironment(bool withoutNull = true) {

                return withoutNull

                ? WebProcessSourceEnvironment != null ? string.Join(",", WebProcessSourceEnvironment.Split(',',' ').Except(new []{"NULL"}, StringComparer.InvariantCultureIgnoreCase)) : null

                : WebProcessSourceEnvironment;

            }

}