import urllib2
import time
url = raw_input("URL: ")
url += ".json"
prev = 0
while True:
   try:
      response = urllib2.urlopen(url)
   except:
      break
   json = response.read()
   pos = json.find('num_comments')
   num = int(json[pos+15:json.find(',',pos)])
   if num > prev:
      print "Number of comments: ", num
      prev = num


   time.sleep(1)