64400
At that point , the station began a gradual process of professionalization , picking up an NPR membership in 1984 .
 NPR
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:
 NPR