input: Write a function to find the two largest numbers in a list.
  assert max_two([2, 4, 5, 9, 10, 11]) == [10, 11]
  assert max_two([1, 2, 3, 4, 5]) == [4, 5]
  assert max_two([10, 9, 8, 7, 6]) == [9, 10]
  assert max_two([10]) == [10]
output: def max_two(lst):
      if len(lst) < 2:
          return lst
      first, second = float('-inf'), float('-inf')
      for number in lst:
          if number > first:
              second = first
              first = number
          elif number > second:
              second = number
      return [second, first] if len(lst) > 1 else [first]