Team script - What to do for a person not in a group? [Solved]

So I want to know how to make a script for a person who is not in my group. I've designated that group as Enemies/Neutral and put their team colour as red.

Would this work? Or do I need to do something else?

function Enter(newPlayer)
if newPlayer:IsNotInGroup(469670) then -- I have a feeling the IsNotInGroup is wrong.
    newPlayer.TeamColor=script.Parent.TeamColor
    end 
end


game.Players.ChildAdded:connect(Enter)

Anyway thanks.