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: To train his horse would be desirable.

Output: acceptable


Input: Consider Input: Ann copied the manuscript, but she didn't finish it.

Output: acceptable


Input: Consider Input: Cohen proved that the continuum hypothesis was independent.


Output: acceptable