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 Q]: Ellen conferred for Helen to come.
[EX A]: unacceptable

[EX Q]: Cynthia devoured on the pizza .
[EX A]: unacceptable

[EX Q]: The writers of any of the reports didn't know the answer.
[EX A]:
unacceptable