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: Carla mopped under the furniture.
Example Output: acceptable

Example Input: John locked Fido in the garage and Mary did so in the room.
Example Output: unacceptable

Example Input: The book was been given by Bill by Sue.
Example Output:
unacceptable