You're given a sentence and your task is to classify whether the sentence is acceptable or not. Any sentence which is grammatically correct, has a naturalistic text, is written by a native speaker and which minimizes superfluous content is acceptable, otherwise unacceptable. If the sentence is acceptable then write "acceptable", otherwise "unacceptable".

Bill made Sarah's gal to me of $40.
unacceptable

I demand that John pay more, the more he eats.
acceptable

One of the most serious problems that some students have be lack of motivation.

acceptable