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

namespace P03HouseParty
{
    class Program
    {
        static void Main(string[] args)
        {


            List<string> guests = new List<string>();
            int count = int.Parse(Console.ReadLine());

            for(int i = 0; i < count; i++)
            {
                string[] command = Console.ReadLine().Split();

                if (command.Length == 3)
                {
                    if (!guests.Contains(command[0]))
                    {
                        guests.Add(command[0]);
                    }
                    else
                    {
                        Console.WriteLine($"{command[0]} is already in the list!");
                    }
                }
                else if (command.Length==4)
                {
                    if (guests.Contains(command[0]))
                    {
                        guests.Remove(command[0]);
                    }
                    else
                    {
                        Console.WriteLine($"{command[0]} is not in the list!");
                    }
                }
            }

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

            }

        }
    }