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:
When can we register for graduation?

Ex Output:
acceptable


Ex Input:
Mary's criticism of him was cruel.

Ex Output:
acceptable


Ex Input:
We elected employer president the boy's guardian's.

Ex Output:

unacceptable