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: The employees staffed the store.
Example Output: acceptable

Example Input: The student protected him.
Example Output: acceptable

Example Input: Mary and kissed an old friend who comes from Miami.
Example Output:
unacceptable