13500
In one letter , a black soldier heading South wrote his wife , " though great is the present national difficulties yet I look forward to a brighter day when I shall have the oportunity of seeing you in the full enjoyment of freedom .
 South
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:
 South