input: Write a python function to find the maximum element in a list of integers.
  assert get_max_elem([1, -2, 3, 4]) == 4
  assert get_max_elem([10, 20, 5, 8]) == 20
  assert get_max_elem([0, -1, -2, -3]) == 0
output: def get_max_elem(lst):
      return max(lst)