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 harder it rains, how much faster a flow do you see in the river?
Example Output: acceptable

Example Input: Mary has never kissed a Man taller than John.
Example Output: acceptable

Example Input: The ball rolled into the gutter.
Example Output:
acceptable