input: 
  def get_max_value(numbers):
      """Prints out the largest value from a given list of numbers.
      >>> get_max_value([2, 4, 1, 6])
      6
      >>> get_max_value([7, 3, 9, 5])
      9
      """
      return max(numbers)
  
output:     print(get_max_value(numbers))