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".

On which bed does Tom sleep?
acceptable

I've seen as much of a coward as Frank.
unacceptable

I said that my father, he was tight as an owl.

acceptable