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: Ellen conferred for Helen to come.

Answer: unacceptable


Question: John's refusal of the offer was shocking.

Answer: acceptable


Question: This needs mending.

Answer:
acceptable