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]: Which packages didn't Sam pick up which are to be mailed tomorrow until it had stopped raining?
[A]: unacceptable


[Q]: Do not use these words in the beginning of a sentence.
[A]: acceptable


[Q]: You must pick any of the flowers.
[A]:
unacceptable