input: Write a function to find the maximum and minimum values in a list.
  assert find_max_min([5, 3, 4, 10, 7]) == (10, 3)
  assert find_max_min([10, 20, 30, 40, 50]) == (50, 10)
  assert find_max_min([-5, -10, 0, 5, 10]) == (10, -10)
output: def find_max_min(lst):
      return (max(lst), min(lst))