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 Q]: Martha climbed the mountain.
[EX A]: acceptable

[EX Q]: The man standing over there's hat impressed me greatly.
[EX A]: acceptable

[EX Q]: We believe that the directors were present.
[EX A]:
acceptable