input: Write a function to parse a JSON data structure. The function should take a JSON string as input and return the values associated with the keys "name", "age", and "occupation" as a tuple.
  
  import json
  
  def parse_json(data):
      data = json.loads(data)
      return data['name'], data['age'], data['occupation']
  
  data = '{"name": "John", "age": 18, "occupation": "Software Engineer"}'
  name, age, occupation = parse_json(data)
  assert name == "John"
  assert age == 18
  assert occupation == "Software Engineer"
  assert parse_json('{"name": "Alice", "age": 22, "occupation": "Data Scientist"}') == ("Alice", 22, "Data Scientist")
  assert parse_json('{"name": "Bob", "age": 30, "occupation": "Designer"}') == ("Bob", 30, "Designer")
output: import json
  
  def parse_json(data):
      data = json.loads(data)
      return data['name'], data['age'], data['occupation']