EqualArrElementsIntoNewArr

static void Main()
        {
            Console.WriteLine("Input length of first array.");
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine("Input length of second array.");
            int m = int.Parse(Console.ReadLine());

            int[] firstArr = new int[n];
            int[] secondArr = new int[m];

            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("First array, Element {0}", (i+1));
                firstArr[i] = int.Parse(Console.ReadLine());
            }
            for (int i = 0; i < m; i++)
            {
                Console.WriteLine("Second array, Element {0}", (i+1));
                secondArr[i] = int.Parse(Console.ReadLine());
            }

            for (int i = 0; i < n; i++)
            { Console.Write(firstArr[i] + " "); }
            Console.WriteLine();

            for (int i = 0; i < m; i++)
            { Console.Write(secondArr[i] + " "); }
            Console.WriteLine();

            Console.WriteLine("Equal elements: ");
            Console.WriteLine();
            IEnumerable<int> en = firstArr.Intersect(secondArr);
            int[] thirdArr = en.ToArray();
            int max = thirdArr[0];
            for (int i = 0; i < thirdArr.Length; i++)
            {
                Console.Write(thirdArr[i] + " ");
                if (thirdArr[i] > max)
                {
                    max = thirdArr[i];
                }
            }
            Console.WriteLine();
            Console.WriteLine("The maximum value from the equal elements is: {0}", max);
        }