TextTransformer

using System;
using System.Text;
using System.Text.RegularExpressions;

namespace TextTransformer
{
    class TextTransformer
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            StringBuilder message = new StringBuilder();

            while (input != "burp")
            {
                message.Append(input);
                input = Console.ReadLine();
            }

            string newMessage = Regex.Replace(message.ToString(), @"\s+", " ");

            StringBuilder output = new StringBuilder();

            //Regex dollarRegex = new Regex(@"\$(.*?)\$");
            //Regex percentdRegex = new Regex(@"\%(.*?)\%");
            //Regex ampersandRegex = new Regex(@"\&(.*?)\&");
            //Regex quoteRegex = new Regex(@"\'(.*?)\'");

            for (int i = 0; i < newMessage.Length; i++)
            {
                char current = newMessage[i];

                switch (current)
                {
                    case '$' :
                    {
                        int count = 0;
                        string currentMessage = "";
                        for (int j = i + 1; j < newMessage.Length; j++)
                        {
                            char curr = newMessage[j];
                            if (curr == '$')
                            {
                                if (currentMessage != String.Empty)
                                {
                                    output.Append(currentMessage);
                                    output.Append(" ");

                                }
                                i += count + 1;
                                break;
                            }
                            if (count % 2 == 0)
                            {
                                curr = (char)(curr + 1);
                            }
                            else
                            {
                                curr = (char)(curr - 1);
                            }
                            count++;

                           currentMessage += curr;

                        }

                    }
                        break;
                    case '%':
                    {
                        int count = 0;
                        string currentMessage = "";
                        for (int j = i + 1; j < newMessage.Length; j++)
                        {
                            char curr = newMessage[j];
                            if (curr == '%')
                            {
                                if (currentMessage != String.Empty)
                                {
                                    output.Append(currentMessage);
                                    output.Append(" ");
                                }
                                i += count + 1;
                                break;
                            }
                            if (count % 2 == 0)
                            {
                                curr = (char)(curr + 2);
                            }
                            else
                            {
                                curr = (char)(curr - 2);
                            }
                            count++;

                            currentMessage += curr;

                        }


                    }
                        break;
                    case '&':
                    {
                        int count = 0;
                        string currentMessage = "";
                        for (int j = i + 1; j < newMessage.Length; j++)
                        {
                            char curr = newMessage[j];
                            if (curr == '&')
                            {
                                if (currentMessage != String.Empty)
                                {
                                    output.Append(currentMessage);
                                    output.Append(" ");
                                }
                                i += count + 1;
                                break;
                            }
                            if (count % 2 == 0)
                            {
                                curr = (char)(curr + 3);
                            }
                            else
                            {
                                curr = (char)(curr - 3);
                            }
                            count++;

                             currentMessage += curr;

                        }

                    }
                        break;
                    case '\'' :
                    {
                        int count = 0;
                        string currentMessage = "";
                        for (int j = i + 1; j < newMessage.Length; j++)
                        {
                            char curr = newMessage[j];
                            if (curr == '\'')
                            {
                                if (currentMessage != String.Empty)
                                {
                                    output.Append(currentMessage);
                                    output.Append(" ");
                                }
                                i += count + 1;
                                break;
                            }
                            if (count%2 == 0)
                            {
                                curr = (char)(curr + 4);
                            }
                            else
                            {
                                curr = (char)(curr - 4);
                            }
                            count++;

                            currentMessage += curr;

                        }
                    }
                        break;
                }
            }

            Console.WriteLine(output.ToString());

        }
    }
}