21968
He invited the chieftains of the former satrapy of Gandhara ( a region presently straddling eastern Afghanistan and northern Pakistan ) , to come to him and submit to his authority .
 Gandhara, Afghanistan, Pakistan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gandhara, Afghanistan, Pakistan