input: Write a python function to print keys of a dictionary where the value is greater than 5.
  assert print_keys_greater_than_5({'a': 1, 'b': 2, 'c': 8, 'd': 4}) == ['c']
  assert print_keys_greater_than_5({'a': 10, 'b': 20, 'c': 5, 'd': 3}) == ['a', 'b']
  assert print_keys_greater_than_5({'a': 2, 'b': 3, 'c': 4, 'd': 5}) == []
output: def print_keys_greater_than_5(d):
      return [k for k, v in d.items() if v > 5]