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: I threw the ball to Mary, but she was looking at the birds flying overhead and didn't even notice.

Output: acceptable


Input: Consider Input: The electrode was struck by ions.

Output: acceptable


Input: Consider Input: Bob is very serious about Mary, but less so than Paul.


Output: acceptable