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: Ellen conferred with Helen.
Example Output: acceptable

Example Input: Cynthia gobbled on the pizza .
Example Output: unacceptable

Example Input: He never achieved anything, didn't he?
Example Output:
unacceptable