77577
119 , for the 22-year - old Mstislav Rostropovich , who gave the first performance in 1950 , with Sviatoslav Richter .
 Mstislav Rostropovich, Sviatoslav Richter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mstislav Rostropovich, Sviatoslav Richter