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: This is the sort of problem which the sooner you solve the more easily you'll satisfy the folks up at corporate headquarters.
Example Output: acceptable

Example Input: Robert knows it is essential that he is well behaved.
Example Output: acceptable

Example Input: Fruit at once hit the roof from the tree.
Example Output:
acceptable