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: Bill understands Mary and himself.
Example Output: unacceptable

Example Input: That few boys came upset any of the teachers.
Example Output: unacceptable

Example Input: Karen asked where to put the chairs.
Example Output:
acceptable