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 threw Mary the ball, but she was looking at the birds flying overhead and didn't even notice.
acceptable

Which problem do you wonder whether John said that Mary solved?
unacceptable

The cat had haven eaten.

unacceptable