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The film , produced by former silent film star Mary Pickford , stars Harpo Marx , Chico Marx , and , in a smaller role than usual , Groucho Marx , plus Ilona Massey , Vera-Ellen , Paul Valentine , Marion Hutton , Raymond Burr , Bruce Gordon ( in his film debut ) , and Eric Blore , with a walk-on by a relatively unknown Marilyn Monroe .
 person: Mary Pickford; person: Harpo Marx; person: Chico Marx; person: Groucho Marx; person: Ilona Massey; person: Vera-Ellen; person: Paul Valentine; person: Marion Hutton; person: Raymond Burr; person: Bruce Gordon; person: Eric Blore; person: Marilyn Monroe
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Mary Pickford; person: Harpo Marx; person: Chico Marx; person: Groucho Marx; person: Ilona Massey; person: Vera-Ellen; person: Paul Valentine; person: Marion Hutton; person: Raymond Burr; person: Bruce Gordon; person: Eric Blore; person: Marilyn Monroe