using System;

public class Program

{

    public static void Main()

    {

        var result = DetectChanges(new[] {1, 2, 3, 4, 5}, new[] {2, 3, 4, 5, 6});

        Console.WriteLine(string.Join(",", result.added), string.Join(",", result.removed));

    }

    static (int[] added, int[] removed) DetectChanges(int[] before, int[] after)

    {

        return (new int[0], new int[0]);

    }

}