using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] arr1 = { 1, 2, 4, 3, 3 };

        int[] arr2 = { 1, 3, 4, 3 };

​

        var result = arr1.Intersect(arr2);

        Console.WriteLine(string.Join("\n", result));

    }

}