using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int[] cards = new int[52];

        for(int i = 0; i < cards.Length; i++) {

            cards[i] = i;

        }

        int[] cardsNew = shuffle(cards, cards.Length - 1);

        for(int i = 0; i < cardsNew.Length; i++) {

            Console.Write(cardsNew[i] + "|");

        }

    }

    public static int[] shuffle(int[] cards, int end) {

        if (end <= 0) {

            return cards;

        }

        shuffle(cards, end - 1);

        Random r = new Random();        

        int indexToSwap = r.Next(0, end);

        int temp = cards[end];

        cards[end] = cards[indexToSwap];

        cards[indexToSwap] = temp;

        return cards;       

    }

}