using System;

namespace exercises

{

  public class Program

    {

        public static void Main(string[] args)

        {

            Console.WriteLine("Name: JENIFER CARDENAS GOMEZ");

            Console.WriteLine(test("abcd"));

            Console.WriteLine(test("a"));

            Console.WriteLine(test("xy"));

            Console.ReadLine();

        }

​

​

        public static string test(string str)

        {

            return str.Length > 1

                ? str.Substring(str.Length - 1) + str.Substring(1, str.Length - 2) + str.Substring(0, 1) : str;

        }

    }

}

​