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Dorofei took over the title of First Pet from Vladimir Putin 's black labrador Koni , when Medvedev was inaugurated on 7 May 2008 .
 Vladimir Putin 's, Medvedev
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vladimir Putin 's, Medvedev