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 richer John gets, the more geniuses John meets.
Example Output: acceptable

Example Input: Copper rods bend easily.
Example Output: acceptable

Example Input: Fred must both have been singing songs and have been drinking beer.
Example Output:
acceptable