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:
Patrick is likely to leave.

Ex Output:
acceptable


Ex Input:
With their teacher, the kids have arrived safely, hasn't he?

Ex Output:
unacceptable


Ex Input:
He cannot have been working.

Ex Output:

acceptable