How To input text from a button?

First, I’d have it so that the buttons get deactivated instead of deleted. Then, I’d have the blank field keep a record of which letters belong to which buttons. I’d have it be a List of game objects, ordered in the same order their letters are put into the blank field.

When the blank field is clicked, it reactivates the last button in its cache, gives it back its letter (which would be at the end of the blank field’s text property), removes the button from the cache, and removes the last letter from its text property.