43313
However , August 2011 investigations shows that after purchase of S-300 surface-to-air missiles , the largest apparent gap in Azerbaijan 's air defense system may have been filled .
 location: Azerbaijan
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: Azerbaijan 
Answer:
 location: Azerbaijan