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 umpire fell off it.
Example Output: acceptable

Example Input: Stephen believed it to be easy to please Kim.
Example Output: acceptable

Example Input: You should leave, shouldn't you?
Example Output:
acceptable