using System;

using System.Collections.Generic;   

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<string> FirstList = new List<string>();

            FirstList.Add("32561");

            FirstList.Add("26631");

        List<string> FirstList2 = new List<string>();

            FirstList.Add("1234");

            FirstList.Add("4567");

            FirstList.Add("4567");

            FirstList.Add("4567");

            FirstList2.Add("26631");

        var listConcat = FirstList.Union(FirstList2);

        var listConcat2 = FirstList.Distinct().ToList();

        var h = DateTime.Now;

        var p = h.ToString("yyyy-MM-dd HH:mm");

               Console.WriteLine("Hello World " + h + " " + p);

        foreach(var g in listConcat2){

           Console.WriteLine("Hello World " + g);

        }

    }

}