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:
I know a boy mad at John.

Ex Output:
acceptable


Ex Input:
I've never seen the one man taller than my father.

Ex Output:
acceptable


Ex Input:
What did Herb start to play only after he drank?

Ex Output:

unacceptable