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 little cat devoured a mouse last night.
Example Output: acceptable

Example Input: What exploded when?
Example Output: acceptable

Example Input: Smith loaned, and his widow later donated, a valuable collection of manuscripts to the library.
Example Output:
acceptable