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: One of the problems was the robins.

Output: acceptable


Input: Consider Input: Sam may have been being interrogated by the FBI.

Output: acceptable


Input: Consider Input: John is taller than Bill.


Output: acceptable