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: Willy is taller than that Bill is is generally believed.

Output: unacceptable


Input: Consider Input: The captain sank the boat.

Output: acceptable


Input: Consider Input: I brought John a razor with which to shave himself.


Output: acceptable