12719
The U.S. embassy in Athens , the consulates general in Athens and Thessaloniki and all U.S. government offices in Greece will be closed on Monday , September 2 in observance of Labour Day , a U.S. national holiday , the embassy said .
 Greece, Thessaloniki, U.S., Athens, Athens, U.S., Labour Day, U.S.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Greece, Thessaloniki, U.S., Athens, Athens, U.S., Labour Day, U.S.