Common Elements

using System;
using System.Linq;

namespace GitHub
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] firstArr = new string[] { "Hey", "Hello", "2", "4" };
            string[] secondArr = new string[] { "10", "Hello", "2", "8" };
            string[] result = new string[secondArr.Length];
            int length = Math.Min(firstArr.Length, secondArr.Length);
            for (int i = 0; i < length; i++)
            {
                if (firstArr.Contains(secondArr[i]))
                {
                    result[i] = secondArr[i];
                }
            }
            Console.WriteLine(string.Join(" ", result));
        }
    }
}