03. Phone Shop

using System;
using System.Linq;
using System.Collections.Generic;

namespace PhoneShop
{
    class Program
    {
        static void Main(string[] args)
        {
            var phones = Console.ReadLine().Split(", ").ToList();

            string input;

            while ((input = Console.ReadLine()) != "End")
            {
                var tokens = input.Split(" - ");
                string command = tokens[0], phone = tokens[1];

                if (command == "Add" && !phones.Contains(phone))
                {
                    phones.Add(phone);
                }
                else if (command == "Remove" && phones.Contains(phone))
                {
                    phones.Remove(phone);
                }
                else if (command == "Bonus phone")
                {
                    var models = phone.Split(':');
                    string oldPhone = models[0], newPhone = models[1];
                    if (phones.Contains(oldPhone))
                    {
                        phones.Insert(phones.IndexOf(oldPhone) + 1, newPhone);
                    }
                }
                else if (command == "Last" && phones.Contains(phone))
                {
                    phones.Remove(phone);
                    phones.Add(phone);
                }
            }

            Console.WriteLine(String.Join(", ", phones));
        }
    }
}