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".

Ex Input:
He established his innocence with the letter.

Ex Output:
acceptable


Ex Input:
On which table and under which flower pot did John put the keys?

Ex Output:
acceptable


Ex Input:
All native speakers have a grammatical competence which can generate an infinite set of grammatical sentences from a finite set of resources.

Ex Output:

acceptable