instruction:
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".
question:
John hit the stone against the wall.
answer:
acceptable


question:
Ellen conferred for Helen to come.
answer:
unacceptable


question:
I know two men behind me.
answer:

acceptable