Text_Transformer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Text_Transformer
{
    class Program
    {
        public static int getWeight(string ch)
        {
            int weight = 0;

            switch (ch)
            {
                case "$":
                    weight = 1;
                    break;
                case "%":
                    weight = 2;
                    break;
                case "&":
                    weight = 3;
                    break;
                case "\'":
                    weight = 4;
                    break;
            }

            return weight;
        }

        static void Main(string[] args)
        {
            StringBuilder sb = new StringBuilder();
            while (true)
            {
                string input = Console.ReadLine();
                if (input.Equals("burp"))
                {
                    break;
                }
                sb.Append(input);
            }

            string gibberishStr = sb.ToString();
            gibberishStr = Regex.Replace(gibberishStr, @"\s+", " ");

            string pattern = @"([$%&'])([^$%&']+)\1";
            Regex textBetweenSpecialChars = new Regex(pattern);
            MatchCollection matchCollection = Regex.Matches(gibberishStr, pattern);

            List<string> words = new List<string>();
            List<string> specialSymbols = new List<string>();
            for (int i = 0; i < matchCollection.Count; i++)
            {
                var match = matchCollection[i].Groups[2].ToString();
                words.Add(match);
                specialSymbols.Add(matchCollection[i].Groups[1].ToString());
            }

            List<string> resultWords = new List<string>();
            for (int i = 0; i < words.Count; i++)
            {
                var chars = words[i].ToCharArray();
                var specialSymbol = specialSymbols[i];
                StringBuilder word = new StringBuilder();
                for (int j = 0; j < chars.Length; j++)
                {
                    char ch = chars[j];
                    char transformedChar = Char.MinValue;
                    if (j%2 == 0)
                    {
                        transformedChar = (char) (ch + getWeight(specialSymbol));
                    }
                    else
                    {
                        transformedChar = (char) (ch - getWeight(specialSymbol));
                    }
                    word.Append(transformedChar);
                }
                resultWords.Add(word.ToString());
            }
            Console.WriteLine(String.Join(" ", resultWords));
        }
    }
}