using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.Write("Enter elements on one line separated by space for the first list: ");

        List<int> list1 = Console.ReadLine().Split().Select(int.Parse).ToList();

​

        Console.Write("Enter elements on one line separated by space for the second list: ");

        List<int> list2 = Console.ReadLine().Split().Select(int.Parse).ToList();

​

        List<int> list3 = new List<int>(list1);

        list3.AddRange(list2);

        list3 = list3.Distinct().ToList();

​

        Console.WriteLine("The two lists combined: " + String.Join(" ", list3));

        List<int> list4 = new List<int>();

        foreach(var el in list1)

        {

            if(list2.Contains(el))

                list4.Add(el);

        }

        if (list4.Count() != 0)

            Console.WriteLine("Elements that exsists in both lists are: " + string.Join(" ", list4));

        else

            Console.WriteLine("No common elements!");

    }

}