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".

Paula spanked her right hand into the naughty child.
unacceptable

Smith was annealing the rings.
acceptable

I explained that we should fix the sink.

acceptable