89832
There he met his contemporary , Richard Burton , and together they joined the Royal Air Force in October 1944 .
 person: Richard Burton; organization: Royal Air Force
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Richard Burton, Royal Air Force 
Answer:
 person: Richard Burton; organization: Royal Air Force