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Created by writer Len Wein and artist Dave Cockrum , he first appeared in " Giant-Size X-Men " # 1 ( May 1975 ) .
 person: Len Wein; person: Dave Cockrum
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: Len Wein, Dave Cockrum 
Answer:
 person: Len Wein; person: Dave Cockrum