input: Write a python function to create a contact and retrieve its full name, email, address, and phone number.
  assert Contact("John", "Doe", "john.doe@example.com", "1234 Elm Street", "555-1234").get_full_name() == "Doe, John"
  assert Contact("Jane", "Smith", "jane.smith@example.com", "5678 Oak Avenue", "555-5678").get_email() == "jane.smith@example.com"
  assert Contact("Tom", "Brown", "tom.brown@example.com", "910 Maple Road", "555-9101").get_address() == "910 Maple Road"
  assert Contact("Alice", "Johnson", "alice.johnson@example.com", "1122 Pine Lane", "555-1122").get_phone_number() == "555-1122"
output: class Contact:
      def __init__(self, first_name, last_name, email, address, phone_number):
          self.first_name = first_name
          self.last_name = last_name
          self.email = email
          self.address = address
          self.phone_number = phone_number
  
      def get_full_name(self):
          return f"{self.last_name}, {self.first_name}"
  
      def get_email(self):
          return self.email
  
      def get_address(self):
          return self.address
  
      def get_phone_number(self):
          return self.phone_number