<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def create_unbroadcast_axis(shape, broadcast_shape):
 """Creates the reduction axis for unbroadcasting. Args: shape: A list. The shape after the broadcast operation. broadcast_shape: A list. The original shape the array being unbroadcast had. Returns: A list. The axes along which the array needs to be reduced. These axes will be distributed evenly into the original shape. """

  return tuple(
      -(1 + i)
      for i in range(len(broadcast_shape))
      if i >= len(shape) or broadcast_shape[-(1 + i)] > shape[-(1 + i)])