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: She speaks enough clearly to be understood.
Example Output: unacceptable

Example Input: John is prouder of having gone than John didn't expect me to believe he would be.
Example Output: unacceptable

Example Input: John wagered a stranger to have been in that haunted house.
Example Output:
unacceptable