<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_rt(self):
 """Returns the right top border of the cell"""


        cell_above_right = CellBorders(self.cell_attributes,
                                       *self.cell.get_above_right_key_rect())
        return cell_above_right.get_b()