using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var forward = new int[] { 1, 2, 3, 4, 5, 6 };

        var forwardStr = string.Join(",", forward);

        Console.WriteLine(forwardStr);

​

        var reverse = forward.Reverse();

        var reverseStr = string.Join(",", reverse);

        Console.WriteLine(reverseStr);

    }

}