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 didn't pick those packages up until it had stopped raining which are to be mailed tomorrow.
Example Output: unacceptable

Example Input: A book was handed to Chris by Pat.
Example Output: acceptable

Example Input: The situation became terrible.
Example Output:
acceptable