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: What did Becky buy?
Example Output: acceptable

Example Input: The king of Rock and Roll is more popular than the one of country music.
Example Output: unacceptable

Example Input: There are arriving three men at that station.
Example Output:
acceptable