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".

I know a boy mad at John.
acceptable

The witch turned him from a prince.
unacceptable

I am afraid of tigers and fond of clowns without exception.

acceptable