5025
The stories center on vampires who take advantage of month-long annual polar night in the town to openly kill and feed at will , massacring most of the townspeople .
 time: polar night
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 time: polar night