19819
It also requested that the Soviet Union promise to attend the international peace conference to determine the ownership of Sakhalin and the entire Chishima Islands .
 geographical social political: the Soviet Union; location: Sakhalin; location: Chishima Islands
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities: the Soviet Union, Sakhalin, Chishima Islands 
Answer:
 geographical social political: the Soviet Union; location: Sakhalin; location: Chishima Islands