input: from typing import Dict
  
  def store_user_data(data: Dict) -> None:
      """ Store user data into a JSON file.
      
      >>> user_data = {"Name": "John", "Age": 25, "City": "New York"}
      >>> store_user_data(user_data)
      # Data stored in 'user_data.json'
      """
  
  def get_user_data() -> Dict:
      """ Retrieve user data from a JSON file.
      
      >>> stored_data = get_user_data()
      >>> print(stored_data)
      {'Name': 'John', 'Age': 25, 'City': 'New York'}
      """
output:     import json
  
      with open('user_data.json', 'w') as file:
          json.dump(data, file)
  
  def get_user_data() -> Dict:
      try:
          with open('user_data.json', 'r') as file:
              return json.load(file)
      except FileNotFoundError:
          return {}