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".

John kept him behind the garage.
acceptable

Which book he read the book was that one.
unacceptable

The thief stole the painting from the museum.

acceptable