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:
Ellen conferred to Helen.

Ex Output:
unacceptable


Ex Input:
The money which I am discussing Sarah's claim that the company squandered amounts to $400,000.

Ex Output:
unacceptable


Ex Input:
The letter established his innocence.

Ex Output:

acceptable