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".

How do you wonder which problem to solve?
unacceptable

John to call would be unlikely.
unacceptable

There are strangers in that garden.

acceptable