using System;

public class Program

{

    public static void Main()

    {

              int[] Arr={1,2,3,4,5,6,7,8,9};

            Console.WriteLine("Было:");

            foreach (int elem in Arr)

                Console.Write("\t" + elem);

            Console.WriteLine();

            Console.WriteLine("Стало:");

            string n = Arr[9].ToString();

            for( int i=9; i>0; i++){

               n = Arr[i].ToString() + Arr[i-1].ToString();

            }

            Console.WriteLine(n);

    }

}