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]: I doubt you can help me in understanding this.
[A]: acceptable


[Q]: Jennifer swatted Steve.
[A]: acceptable


[Q]: He turned from a prince into a frog.
[A]:
acceptable