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:
Sandy sang a song.

Ex Output:
acceptable


Ex Input:
I washed yourself.

Ex Output:
unacceptable


Ex Input:
There may exist a man in the park.

Ex Output:

acceptable