using System;

using System.Collections.Generic;                   

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var encrypter = new Encrypter();

        string textToEncrypt = "hello world";

        string encryptedText = encrypter.Encrypt(textToEncrypt);

        string decryptedText = encrypter.Decrypt(encryptedText);

        Console.WriteLine("initial text: {0}", textToEncrypt);

        Console.WriteLine("encrypted text: {0}", encryptedText);

        Console.WriteLine("decrypted text: {0}", decryptedText);

    }   

}

​

public class Encrypter

{

    public string Encrypt(string text)

    {

        return text;

    }

    public string Decrypt(string text)

    {

        return text;

    }   

}