input: Write a function to extract the first two elements of a list.
  assert extract_first_two([2, 4, 6, 8, 10]) == (2, 4)
  assert extract_first_two([1, 3, 5, 7]) == (1, 3)
  assert extract_first_two([10, 20, 30]) == (10, 20)
output: def extract_first_two(lst):
      return tuple(lst[:2])