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: A solution immediately presented.
Example Output: unacceptable

Example Input: John gave Mary, and Joan presented to Fred, books which looked.
Example Output: acceptable

Example Input: Fred gave flowers to his sweetie because Frank had.
Example Output:
acceptable