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".

John is taller than Bill.
acceptable

The foxes seem compatible with the chickens.
acceptable

John learned French immediately perfectly.

unacceptable