6513
Batman 's characteristic utility belt was introduced in " Detective Comics " # 29 ( July 1939 ) , followed by the boomerang-like batarang and the first bat-themed vehicle , the Batplane , in # 31 ( Sept. 1939 ) .
 person: Batman
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Batman