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

namespace GuestList
{
    class Program
    {
        static void Main(string[] args)
        {
            int commands = int.Parse(Console.ReadLine());

            List<string> invitations = new List<string>();

            for (int i = 0; i < commands; i++)
            {

                string line = Console.ReadLine();

                string[] currentGuest = line.Split(" ").ToArray();
                string name = currentGuest[0];
                string isGoing = "";

                for (int k = 1; k < currentGuest.Length; k++)
                {
                    isGoing += currentGuest[k] + " ";
                }

                if (isGoing.Trim() == "is going!")
                {
                    if (!invitations.Contains(name))
                    {
                        invitations.Add(name);
                    }
                    else
                        Console.WriteLine($"{name} is already in the list!");
                }
                else if (isGoing.Trim() == "is not going!")
                {

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





            }
            Console.WriteLine(string.Join($"\n", invitations));
        }
    }
}