input: Write a python function to sum elements in two lists with the same length.
  assert sum_elements_in_lists([2, 3, 4], [2, 5, 6]) == [4, 8, 10]
  assert sum_elements_in_lists([1, 2, 3], [4, 5, 6]) == [5, 7, 9]
  assert sum_elements_in_lists([0, 0, 0], [1, 1, 1]) == [1, 1, 1]
output: def sum_elements_in_lists(list1, list2):
      return [x + y for x, y in zip(list1, list2)]