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:
Fred gave the ball over Molly.

Ex Output:
unacceptable


Ex Input:
He sees often Mary.

Ex Output:
unacceptable


Ex Input:
I know which guys you've dated, but I don't know which guys you haven't.

Ex Output:

acceptable