using System;

public class Program

{

    public static void Main()

    {

Console.WriteLine("ANGELA RAMIREZ");

             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;

        }

    }

​