HouseParty

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


namespace HouseParty
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int numbersOfCommand = int.Parse(Console.ReadLine());
            List<string> guests = new List<string>();

            for (int i = 0; i < numbersOfCommand; i++)
            {
              string command = Console.ReadLine();
                string[] commandArray = command.Split().ToArray();
                string name = commandArray[0];

                if (commandArray.Count() == 3)
                {
                    if (guests.Contains(name)==false)
                    {
                        guests.Add(name);
                    }

                    else
                    {
                        Console.WriteLine($"{name} is already in the list!");
                    }

                }

                else if (commandArray.Count() == 4)
                {
                    if (guests.Contains(name))
                    {
                        guests.Remove(name);

                    }
                    else
                    {
                        Console.WriteLine($"{name} is not in the list!");
                    }

                }

            }

            foreach (var item in guests)
            {
                Console.WriteLine(item);
            }
        }
    }
     }