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:
What did he look up?

Ex Output:
acceptable


Ex Input:
John hit the stone against the wall.

Ex Output:
acceptable


Ex Input:
Does John have gone to the library?

Ex Output:

unacceptable