There are 6 shapes on a 9x9 grid. Which shape is closest to the red rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: red rectangle at (4, 4)
Distance from target shape to orange right_triangle at (4, 6): 2
Distance from target shape to purple right_triangle at (2, 7): 5
Distance from target shape to pink rectangle at (6, 8): 6
Distance from target shape to blue rectangle at (0, 5): 5
Distance from target shape to brown square at (5, 7): 4
Closest shape is the orange right_triangle at (4, 6) with distance 2</think>

<answer>(4, 6)</answer>