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: That Jack ever slept is possible.

A: unacceptable
****
Q: The two boys looked up the high stairs.

A: acceptable
****
Q: How do you wonder who could solve this problem.

A:
unacceptable
****