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".

Input: Consider Input: John knows whose book Mary bought and Tom talked.

Output: unacceptable


Input: Consider Input: Paula swatted the cloth on the fly.

Output: unacceptable


Input: Consider Input: I wonder who could solve the problem in this way.


Output: acceptable