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: Where did John put the books?
Example Output: acceptable

Example Input: I threw the ball to Mary, but she was looking at the birds flying overhead and didn't even notice.
Example Output: acceptable

Example Input: It was to the student that the teacher gave the best advice.
Example Output:
acceptable