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: Where did the policeman meet several young students?

Output: acceptable


Input: Consider Input: John is prouder of having gone than I expected you to believe he would be of not having fallen asleep.

Output: acceptable


Input: Consider Input: There is arriving three men at that station.


Output: unacceptable