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When DeLesseps S. " Chep " Morrison , resigned his position as mayor in 1961 to become U.S. Ambassador to the Organization of American States , the City Council elected Councilman Schiro , then Councilman-At-Large , as interim mayor .
 DeLesseps S. " Chep " Morrison, Organization of American States, Schiro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 DeLesseps S. " Chep " Morrison, Organization of American States, Schiro