There are 3 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 (6, 1)
Distance from target shape to orange square at (4, 3): 4
Distance from target shape to brown rectangle at (5, 6): 6
Closest shape is the orange square at (4, 3) with distance 4</think>

<answer>(4, 3)</answer>