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".

John hit the stone against the wall.
acceptable

The policeman kissed the puppy.
acceptable

Not until I was perhaps twenty-five was when I read them and enjoyed them.

unacceptable