using System;
using System.Collections.Generic;
using System.Linq;
 
namespace ProgramConsole
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var list1 = new List<string>{
            "a", "b", "c"
        };
 
            var list2 = new List<string>{
            "c", "d", "e"
        };
 
           IEnumerable<string> dubvalues = list2.Intersect(list1);
 
            foreach (var i in dubvalues)
            {
                Console.WriteLine(i);
            }
        }
    }
}

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