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: Pauline smiled her thanks.
Example Output: acceptable

Example Input: The ship was sunk to collect the insurance.
Example Output: acceptable

Example Input: Bill left when that no one else was awake is certain.
Example Output:
unacceptable