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: In the book, he talks about his ups and downs at school.
Example Output: acceptable

Example Input: John a decidedly taller man than Bill.
Example Output: acceptable

Example Input: Kim jogs under the hill.
Example Output:
acceptable