527
In April 2011 it was awarded a five-year contract by the  Charlotte Area Transit System  (  CATS  ) for the exclusive right to sell advertising on the city's buses and light-rail vehicles .
 alternate names: Charlotte Area Transit System, CATS
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 alternate names: Charlotte Area Transit System, CATS