using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<int> initialList = new List<int>{1,2,3,4,5,6};

        List<int> secondList = new List<int>{1,4,5};

        var finalList = initialList.Except(secondList);

        foreach(var i in finalList)

        {

            Console.WriteLine(i);

        }

    }

}