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]: The one who broke the window was Mr. Kim.
[EX A]: acceptable

[EX Q]: John is prouder of having gone than John didn't expect me to believe he would be.
[EX A]: unacceptable

[EX Q]: Mickey looked up the reference.
[EX A]:
acceptable