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Shterev retired in 1933 to take up the role of director of the Football school in Plovdiv , a post he held until his death in 1972 .
 Shterev, Plovdiv
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Shterev, Plovdiv