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".

What did Becky buy?
acceptable

John has often kissed Mary.
acceptable

President Lincoln delivered her Gettysburg Address in 1863.

unacceptable