input: Write a python function to load a JSON string and print the keys whose associated list has an even number of elements.
  assert print_even_elements_keys('{"apple":["red","green"],"pear":["green"],"grapes":["green","red"],"banana":["yellow"]}') == ["apple", "grapes"]
  assert print_even_elements_keys('{"apple":["red"],"pear":["green"],"grapes":["green"],"banana":["yellow","green"]}') == ["banana"]
  assert print_even_elements_keys('{"apple":["red"],"pear":["green"]}') == []
output: import json
  
  def print_even_elements_keys(json_string):
      data = json.loads(json_string)
      even_keys = [key for key, value in data.items() if len(value) % 2 == 0]
      return even_keys