103319
Series overview Episode list Season 1 ( 2009 ) Season 2 ( 2009 – 10 ) Season 3 ( 2010 – 11 ) Season 4 ( 2011 – 12 ) On January 10 , 2011 , ABC announced that Castle had been renewed for a fourth season .
 ABC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 ABC