177720
He challenged seven other swimmers on the second heat , including Olympic veterans Nicholas Neckles of Barbados , George Gleason of the Virgin Islands , and Sung Min of South Korea .
 Nicholas Neckles, Sung Min
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nicholas Neckles, Sung Min