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".
--------
Question: We spotted that they were running.

Answer: unacceptable


Question: When can we register for graduation?

Answer: acceptable


Question: Ellen told Helen about the situation.

Answer:
acceptable