25052
Complete units have been trained and indoctrinated in the U.S.S.R. and other East bloc nations ; 30,000 to 40,000 of these troops have returned .
 U.S.S.R., East bloc, 30,000, 40,000
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 U.S.S.R., East bloc, 30,000, 40,000