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: A big green insect flew into the soup.
Example Output: acceptable

Example Input: Which granny does Aunt Hattie want me to be nice and kiss?
Example Output: acceptable

Example Input: I do not be happy.
Example Output:
unacceptable