using System;

using System.Linq;

​

namespace Except

{

    public class Program

    {

        public static void Main(string[] args)

        {

            string[] numbers1 = {"a", "b", "c", "d"};

            string[] numbers2 = {"c", "d", "e", "f"};

​

            var result = numbers1.Except(numbers2);

            foreach (var item in result)

            {

                Console.WriteLine(item);

            }

            Console.ReadLine();

        }

    }

}