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Boris Gavriilovich Shpitalny ( ) ( August 7 ( O.S. July 25 ) , 1902 , Rostov-on-Don — February 6 , 1972 , Moscow ) was a Soviet designer of aircraft guns and cannons , Hero of Socialist Labor ( 1940 ) , professor ( 1949 ) .
 Boris, Rostov-on-Don, Moscow, Soviet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Boris, Rostov-on-Don, Moscow, Soviet