02. Sets of Elements

using System;
using System.Collections.Generic;
using System.Linq;

namespace _02._Sets_of_Elements
{
    class SetsofElements
    {
        static void Main(string[] args)
        {
            var setsParameters = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();

            var setOne = new HashSet<int>();
            var setTwo = new HashSet<int>();

            if (setsParameters[0] > 0 && setsParameters[1] > 0)
            {
                for (int firsSet = 0; firsSet < setsParameters[0]; firsSet++)
                {
                    setOne.Add(int.Parse(Console.ReadLine()));

                }

                for (int secondSet = 0; secondSet < setsParameters[1]; secondSet++)
                {
                    setTwo.Add(int.Parse(Console.ReadLine()));

                }

                var duplicates = new HashSet<int>();



                for (int i = 0; i < setOne.Count; i++)
                {
                    var temp = setOne.ElementAt(i);
                    if (setTwo.Contains(temp))
                    {
                        duplicates.Add(temp);
                    }
                }

                //var dupli = setOne.Intersect(setTwo);

                foreach (int item in duplicates)
                {
                    Console.Write($"{item} ");
                }


            }


        }
    }
}