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".

Q: Have in our class the kids arrived safely?

A: unacceptable
****
Q: Every man who said he would buy some salmon did.

A: acceptable
****
Q: A good friend is remained to me.

A:
unacceptable
****