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While President Boris Yeltsin frequently used his power of pardon ( 1998 – 7,000 to 8,000 cases ) , his successor Vladimir Putin is much more hesitant ; he granted five pardons in 2014 and two in 2015 .
 Boris Yeltsin, Vladimir Putin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Boris Yeltsin, Vladimir Putin