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: Smith inscribed the ring with his name.
Example Output: acceptable

Example Input: It tries to be warm in September.
Example Output: unacceptable

Example Input: We need more intelligent leaders.
Example Output:
acceptable