18120
The monorail receives no operating funds from public sources , with costs covered by fares and federal grants for capital projects ; the service is unusual among U.S. public transport system because it makes an operating profit .
 location: U.S.
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: U.S. 
Answer:
 location: U.S.