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".

Input: Consider Input: Where did John put the books?

Output: acceptable


Input: Consider Input: John a decidedly taller man than Bill.

Output: acceptable


Input: Consider Input: The knowledge of the problem is quite thorough.


Output: acceptable