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 problem do you wonder whether John said that Mary solved?
[A]: unacceptable


[Q]: the book with a red cover of poems from Blackwell by Robert Burns takes a very long time to read.
[A]: unacceptable


[Q]: I wonder on which shelf John will put the book?
[A]:
acceptable