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".

Input: Consider Input: The boy's loud playing of the piano drove everyone crazy.

Output: acceptable


Input: Consider Input: It seemed to rain.

Output: acceptable


Input: Consider Input: John had an error in the proof Sarah presented.


Output: unacceptable