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: He never achieved anything, didn't he?

Output: unacceptable


Input: Consider Input: The cat is out of the bag.

Output: acceptable


Input: Consider Input: They are kind to her.


Output: acceptable