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".

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

Ex Output:
acceptable


Ex Input:
Smith inscribed the ring with his name.

Ex Output:
acceptable


Ex Input:
Mary thinks that John said that Susan likes pictures of himself?

Ex Output:

unacceptable