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:
He walked right into the wall.

Ex Output:
acceptable


Ex Input:
They're not finding it a stress being in the same office.

Ex Output:
acceptable


Ex Input:
The students called me a teacher.

Ex Output:

acceptable