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".

The students looked the high stairs up.
unacceptable

The one who broke the window was Mr. Kim.
acceptable

Tom will not force you to marry any student.

acceptable