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 saw him leaving the main building.

A: acceptable
****
Q: Fred threw the ball under the porch.

A: acceptable
****
Q: Aunt Mary made the boys all a good mother.

A:
unacceptable
****