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Meanwhile  Kostov  the former Prime Minister and UDF party  leader  went on to form his own party - Democrats for a Strong Bulgaria .
 title of person: Kostov, leader
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Kostov, leader 
Answer:
 title of person: Kostov, leader