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 admired him a teacher.
Example Output: unacceptable

Example Input: Sam may have been being interrogated by the FBI.
Example Output: acceptable

Example Input: John believes him to have been at the game.
Example Output:
acceptable