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: The students looked the high stairs up.

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

A: unacceptable
****
Q: Bunnies carrots eat.

A:
unacceptable
****