input: 
  def dict_sum(dictionary: dict) -> int:
      """Compute the sum of the values of a given dictionary.
      >>> dict_sum({'A': 5, 'B': 6, 'C': 10})
      21
      >>> dict_sum({'X': 3, 'Y': 15, 'Z': 2})
      20
      """
      sum_values = 0
      for value in dictionary.values():
          sum_values += value
      return sum_values
  
output:     sum_values = 0
      for value in dictionary.values():
          sum_values += value
      return sum_values