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".

When did you get back and what did you bring me?
acceptable

I wonder who could solve the problem in this way.
acceptable

Harry thinks so, although no one else thinks Sally is innocent.

unacceptable