input: Write a python function to parse a JSON string and extract the values of "name" and "city".
  assert parse_json('{"name": "John", "age": 32, "city": "New York"}') == ("John", "New York")
  assert parse_json('{"name": "Alice", "age": 28, "city": "Los Angeles"}') == ("Alice", "Los Angeles")
  assert parse_json('{"name": "Bob", "age": 45, "city": "Chicago"}') == ("Bob", "Chicago")
output: import json
  
  def parse_json(json_string):
      data = json.loads(json_string)
      return data["name"], data["city"]