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:
I confused Maria and Anna.

Ex Output:
acceptable


Ex Input:
You will Bob believe.

Ex Output:
unacceptable


Ex Input:
David constructed the bricks into a house.

Ex Output:

unacceptable