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".

Robert thinks that student should eat asparagus.
acceptable

Mary picked any of the flowers.
unacceptable

The fence hits easily.

unacceptable