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".

Example Input: Sam may have been being interrogated by the FBI.
Example Output: acceptable

Example Input: With their teacher, the kids have arrived safely, hasn't he?
Example Output: unacceptable

Example Input: That the police wanted him worried Johns but it didn't worry the boy who Mary knew.
Example Output:
acceptable