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: Where did the policeman meet several young students?
Example Output: acceptable

Example Input: I've never seen the one man taller than my father.
Example Output: acceptable

Example Input: Old pictures of themselves convinced the children to pretend to be adults.
Example Output:
unacceptable