77701
Four party leaders were chosen using this system : Ralph Klein ( 1992 ) ; Ed Stelmach ( 2006 ) ; Alison Redford ( 2011 ) ; and Jim Prentice ( 2014 ) .
 Ralph Klein, Ed Stelmach, Alison Redford, Jim Prentice
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ralph Klein, Ed Stelmach, Alison Redford, Jim Prentice