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Peter Demens ( – January 21 , 1919 ) born Pyotr Alexeyevitch Dementyev ( ) was a Russian immigranmt to the United States who became a raliway owner and one of the founders of the U.S. city of St. Petersburg , Florida .
 Demens, U.S., St. Petersburg , Florida
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Demens, U.S., St. Petersburg , Florida