secret chat

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

namespace _01._Furniture
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            string[] command = Console.ReadLine().Split(":|:").ToArray();

            while (command[0] != "Reveal")
            {
                if (command[0] == "InsertSpace")
                {
                    int index = int.Parse(command[1]);
                    input = input.Insert(index, " ");
                }
                if (command[0] == "Reverse")
                {
                    if (input.Contains(command[1]))
                    {
                        int index = input.IndexOf(command[1]);
                        input = input.Remove(index, command[1].Length);

                        char[] charArray = command[1].ToCharArray();
                        Array.Reverse(charArray);
                        string reversed = new string(charArray);
                        input = string.Concat(input, reversed);
                    }
                    else
                    {
                        Console.WriteLine("error");
                        command = Console.ReadLine().Split(":|:").ToArray();
                        continue;
                    }
                }
                if (command[0] == "ChangeAll")
                {
                    if (input.Contains(command[1]))
                    {
                        input = input.Replace(command[1], command[2]);
                    }
                }

                Console.WriteLine(input);
                command = Console.ReadLine().Split(":|:").ToArray();
            }

            Console.WriteLine($"You have a new text message: {input}");

        }
    }
}