input: Write a python function to find the maximum and minimum numbers in a list.
  assert find_max_min([4, 19, -3, 27, -9, 5]) == (27, -9)
  assert find_max_min([10, 20, 30, 40, 50]) == (50, 10)
  assert find_max_min([-1, -2, -3, -4, -5]) == (-1, -5)
output: def find_max_min(lst):
      return (max(lst), min(lst))