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 one who broke the window was Mr. Kim.
Example Output: acceptable

Example Input: Penny rowed across the lake.
Example Output: acceptable

Example Input: Heidi gave a present to herself.
Example Output:
acceptable