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: The branches knocked against the wall.
Example Output: acceptable

Example Input: It's we go to the meeting, that Sally will tell us when.
Example Output: unacceptable

Example Input: The cat is believed to be out of the bag.
Example Output:
acceptable