52353
Although the German air arm was strong , with a total of 123 airships by the end of the war , they were vulnerable to attack and engine failure , as well as navigational issues .
 None
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:  
Answer:
 None