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For instance , David Letterman is well known for branching into late night television as a talk show host while honing his skills as a stand-up comedian , Barbra Streisand ventured into acting while operating as a singer , and Clint Eastwood achieved even greater fame in Hollywood as a film director and producer than for his acting credentials .
 David Letterman, Barbra Streisand, Clint Eastwood, Hollywood
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 David Letterman, Barbra Streisand, Clint Eastwood, Hollywood