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".

The cook boned the fish of bones.
unacceptable

Do not use these words in the beginning of a sentence.
acceptable

The prisoner must have been being interrogated when the supervisor walked into the room and saw what was going on and put a stop to it.

acceptable