11858
After a Royal Canadian Air Force ( RCAF ) evaluation in 1938 recommended a number of changes , a total of 431 Finch trainers were built for the RCAF between 1939 and 1941 .
 organization: Royal Canadian 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: Royal Canadian Air Force 
Answer:
 organization: Royal Canadian Air Force