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: With their teacher, the kids have arrived safely, hasn't he?

Output: unacceptable


Input: Consider Input: John gave Mary, and Joan presented to Fred, books which looked.

Output: acceptable


Input: Consider Input: The message was that you should come on time.


Output: acceptable