using System;
using System.Linq;
public class Program
{
public static void Main()
int[] first = { 1, 2, 3, 4 };
int[] second = { 0, 2, 3, 5 };
var inFirstButNotInSecond = first.Except(second);
// Output the example
foreach(var number in inFirstButNotInSecond)
Console.WriteLine(number);
}