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 little cat devoured a mouse last night.
acceptable

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

Mary looked at the sky.

acceptable