How do you make a script that detects a guest?[ANSWERED]

I'm not kicking the guest when a guest joins a game, i just want to know. pls answer m8.

A Guest's userId is equal to -1, which no other player would have. An example script of detecting their userId.

game.Players.PlayerAdded:connect(function(player)
	if player.userId == -1 then
		print(player.Name.." is a guest!")
	end
end)