using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = {1, 1, 2, 3, 3};
int[] numbers2 = {1, 3, 3, 4};
Console.Write(numbers.Intersect(numbers2));
}
}