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".

The king of Rock and Roll is more popular than the one of country music.
unacceptable

John a decidedly taller man than Bill.
acceptable

Any bird flies.

acceptable

