input: Write a python function to get the last N elements from a list.
  assert get_last_elements([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 5) == [6, 7, 8, 9, 10]
  assert get_last_elements([10, 20, 30, 40, 50], 2) == [40, 50]
  assert get_last_elements([5, 7, 9, 8, 6, 4, 3], 3) == [6, 4, 3]
output: def get_last_elements(lst, n):
      return lst[-n:]