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In addition , the cities of Brno , Liberec , Most , Olomouc , Ostrava , Plzeň , and Prague have tram systems .
 Brno, Liberec, Most, Olomouc, Ostrava, Plzeň, Prague
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brno, Liberec, Most, Olomouc, Ostrava, Plzeň, Prague