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Yelena Anatolyevna Tkach ( also Elena Tkach , ; born May 19 , 1970 in Kopeysk , Chelyabinsk ) is a Russian sport shooter .
 Tkach, Elena Tkach, Kopeysk, Chelyabinsk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tkach, Elena Tkach, Kopeysk, Chelyabinsk