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 pencil with that he is writing broke.
Example Output: unacceptable

Example Input: Willy is taller than Bill by as much as I know a boy who thinks that Bill is taller than Dan.
Example Output: unacceptable

Example Input: Harry believes that Sally is innocent, although no one else believes it.
Example Output:
acceptable