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".

[Q]: Not many books survived the fire, did they?
[A]: acceptable


[Q]: I am frightened of tigers.
[A]: acceptable


[Q]: That the sun was out was obvious.
[A]:
acceptable