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".

[EX Q]: It's the second Monday that we get back from Easter.
[EX A]: acceptable

[EX Q]: Sam didn't pick those packages up until it had stopped raining which are to be mailed tomorrow.
[EX A]: unacceptable

[EX Q]: Mary runs often the marathon.
[EX A]:
unacceptable