There are 4 shapes on a 9x9 grid. Which shape is closest to the yellow 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: yellow rectangle at (8, 3)
Distance from target shape to purple square at (5, 8): 8
Distance from target shape to orange rectangle at (6, 1): 4
Distance from target shape to gray square at (3, 2): 6
Closest shape is the orange rectangle at (6, 1) with distance 4</think>

<answer>(6, 1)</answer>