4855
Chennai , Delhi , Kolkata , and Mumbai had to switch by 31 October 2012 .
 location: Chennai; location: Delhi; location: Kolkata; location: Mumbai
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:
 location: Chennai; location: Delhi; location: Kolkata; location: Mumbai