There are 3 shapes on a 9x9 grid. Which shape is closest to the brown 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: brown rectangle at (8, 6)
Distance from target shape to orange rectangle at (0, 7): 9
Distance from target shape to purple rectangle at (5, 4): 5
Closest shape is the purple rectangle at (5, 4) with distance 5</think>

<answer>(5, 4)</answer>