105699
Contents Written in Kanbun - style and contained within fifty volumes , the contents cover a span of thirty years from 858 to 887 corresponding to three imperial reigns : Seiwa , Yōzei , and Kōkō .
 Seiwa, Yōzei, Kōkō
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Seiwa, Yōzei, Kōkō