13437
It is one of the SKY universities a historical acronym used in  South Korea  to refer to Seoul National University  Korea University  and Yonsei University which are widely regarded as the three most prestigious universities in the country .
 country of headquarters: South Korea, Korea University
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 country of headquarters: South Korea, Korea University