using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    static List<string> firstList = new List<string> {"One", "Two","Three"};

    static List<string> second = new List<string> {"One", "Two","3"};

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var common = firstList.Where(p=> second.Contains(p));

        foreach(var s in common)

        {

            Console.WriteLine(s);

        }

    }

}