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".

Ex Input:
Not many books survived the fire, did they?

Ex Output:
acceptable


Ex Input:
What exploded when?

Ex Output:
acceptable


Ex Input:
Ann is going to send a picture of Chairman Mao to her teacher, as soon as she gets home.

Ex Output:

acceptable