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: I have some voice exercises to play the guitar and sing.
Example Output: unacceptable

Example Input: The question of whether John met Mary worries the people who support.
Example Output: acceptable

Example Input: The students know the answers.
Example Output:
acceptable