9841
Douglas Fairbanks assisted with its development , and Charlie Chaplin and Joseph M. Schenck helped to promote it .
 person: Douglas Fairbanks; person: Charlie Chaplin; person: Joseph M. Schenck
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: Douglas Fairbanks; person: Charlie Chaplin; person: Joseph M. Schenck