using System;

public class Program

{

    private static void PrintArray(int[] arr)

        {

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

            Console.Write("{0} ",arr[i]);

        Console.WriteLine();

    }

    public static void Main()

    {

        int[] arr={1,2,3,4};

        //PrintArray(arr);

        for (int c=0;c<23;)

        {

            for (int i=1;i<arr.Length;i++)

            {

              int tmp=arr[0];

              arr[0]=arr[i];

              arr[i]=tmp;

              PrintArray(arr);

              c++;

            }

        }

        Console.WriteLine("Hello World");

    }

}