input: def calculate_average_of_five_numbers(inputs: List[int]) -> float:
      """
      Calculate the average of five numbers entered by a user.
      >>> calculate_average_of_five_numbers([10, 20, 30, 40, 50])
      30.0
      >>> calculate_average_of_five_numbers([5, 15, 25, 35, 45])
      25.0
      """
output:     if len(inputs) != 5:
          raise ValueError("The list must contain exactly five numbers.")
      return sum(inputs) / 5