# your code goes here
 
import json
 
class Contact:
  def __init__(self, first, last):
    self.first = first
    self.last = last
 
  @property
  def full_name(self):
    return ("{} {}".format(self.first, self.last))
 
class ContactEncoder(json.JSONEncoder):
  def default(self, obj):
    if isinstance(obj, Contact):
      return  {"is_contact": 'T'
              ,"first": obj.first
              ,"last": obj.last
              ,"full_name": obj.full_name}
    return super().default(obj)
 
if __name__ == "__main__":
  c = Contact("Jay", "Loophole")
  print(json.dumps(c.__dict__))
  print(json.dumps(c, cls=ContactEncoder))

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