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Before taking the post in Moscow , Gaston Stronck was Ambassador of Luxembourg to Denmark , Finland , Norway and Sweden ( 2003-2007 ) and the first Ambassador of Luxembourg to the Political and Security Committee ( PSC ) of the European Union ( EU ) ( 2000-2003 ) .
 Gaston Stronck, Luxembourg, Luxembourg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gaston Stronck, Luxembourg, Luxembourg