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".

Example Input: Have in our class the kids arrived safely?
Example Output: unacceptable

Example Input: Ron wanted to wear a tuxedo to the party, but Caspar couldn't decide whether to.
Example Output: unacceptable

Example Input: As it rains harder, how much faster a flow that appears in the river?
Example Output:
unacceptable