warrior's quest

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();

            var command = Console.ReadLine().Split().ToArray();

            while (command[0] != "For")
            {
                if (command[0] == "GladiatorStance")
                {
                    input = input.ToUpper();
                    Console.WriteLine(input);
                }
                else if (command[0] == "DefensiveStance")
                {
                    input = input.ToLower();
                    Console.WriteLine(input);
                }
                else if (command[0] == "Dispel")
                {
                    int index = int.Parse(command[1]);
                    char[] chars = input.ToCharArray();

                    if (index >= 0 && index < chars.Length)
                    {
                        chars[index] = char.Parse(command[2]);
                        input = new string(chars);
                        Console.WriteLine("Success!");
                    }
                    else
                    {
                        Console.WriteLine("Dispel too weak.");
                    }

                }
                else if (command[0] == "Target")
                {
                    if (command[1] == "Change")
                    {
                        input = input.Replace(command[2], command[3]);
                        Console.WriteLine(input);
                    }
                    if (command[1] == "Remove")
                    {
                        input = input.Replace(command[2], "");
                        Console.WriteLine(input);
                    }
                }
                else
                {
                    Console.WriteLine("Command doesn't exist!");
                }

                command = Console.ReadLine().Split().ToArray();
            }
        }
    }
}