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His last production was The Lovable Cheat ( 1949 ) , an inexpensive but worthwhile adaptation of a Balzac story which boasted an impressive cast including Charles Ruggles , Alan Mowbray , and Buster Keaton .
 Balzac, Charles Ruggles, Alan Mowbray, Buster Keaton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Balzac, Charles Ruggles, Alan Mowbray, Buster Keaton