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".

How do you wonder which problem to solve?
unacceptable

Have in our class the kids arrived safely?
unacceptable

The ball rolled from the bush to the tree.

acceptable