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".
--------
Question: Stephen believed the cat to be out of the bag.

Answer: acceptable


Question: My father, that he's lived here all his life is well-known to the cops.

Answer: acceptable


Question: Every student answered any question.

Answer:
unacceptable