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: Paula spanked her right hand into the naughty child.

A: unacceptable
****
Q: Have in our class the kids arrived safely?

A: unacceptable
****
Q: She could not have been working.

A:
acceptable
****