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".

The tool that Jones got was more helpful than the one that Smith got.
acceptable

The meeting began at 4 P.M.
acceptable

John believes Sally to be polite.

acceptable