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:
John is taller than Bill.

Ex Output:
acceptable


Ex Input:
the book with a red cover of poems from Blackwell by Robert Burns takes a very long time to read.

Ex Output:
unacceptable


Ex Input:
They spoke to the janitor about that robbery yesterday, the cops.

Ex Output:

acceptable