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:
Nora sent at the book to Peter.

Ex Output:
unacceptable


Ex Input:
How do you wonder which problem to solve?

Ex Output:
unacceptable


Ex Input:
Nora brought the book to the meeting.

Ex Output:

acceptable