Destroy Last Cloned Object of Scene when pressing "Z"

I'm trying to make it so if you want to Undo the last spawned in Object with my spawn menu it would Destroy it by pressing "Z". But I don't know how to implement this, is it possible through some List of some sort? So every Cloned/Spawned in item goes directly to a list and then when you undo it will remove/destroy the newest from the list?

 

A stack would be ideal for this. Its like a list, but in a specific order. You can push objects onto it and when you pop it the last added item will be returned and removed.
Every time you clone you add to the stack, every z you pop the last item off the stack and destroy it

 

I'm gonna try this, thanks!