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:
It is raining.

Ex Output:
acceptable


Ex Input:
He established his innocence with the letter.

Ex Output:
acceptable


Ex Input:
Sandy sang a song for me.

Ex Output:

acceptable