Sets of Elements

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace solutions
{
    class Program
    {
        public static void Main()
        {
            var sets = Console.ReadLine().Split().Select(int.Parse).ToArray();

            var firstSet = new HashSet<string>();
            var secondSet = new HashSet<string>();
            var result = new HashSet<string>();

            for (int i = 0; i < sets[0] + sets[1]; i++)
            {
                var input = Console.ReadLine();

                if (i < sets[0])
                {

                    firstSet.Add(input);
                }
                else
                {
                    secondSet.Add(input);
                }
            }

            var minHash = new HashSet<string>();
            var maxHash = new HashSet<string>();

            if (firstSet.Count < secondSet.Count)
            {
                minHash = firstSet;
                maxHash = secondSet;
            }
            else
            {
                minHash = secondSet;
                maxHash = firstSet;
            }
            foreach (var item in minHash)
            {
                if (maxHash.Contains(item))
                {
                    result.Add(item);
                }
            }

            Console.WriteLine(string.Join(" ", result));
        }
    }
}