There are 6 shapes on a 10x10 grid. Which shape is closest to the blue 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: blue rectangle at (3, 6)
Distance from target shape to gray trapezoid at (1, 8): 4
Distance from target shape to green square at (4, 3): 4
Distance from target shape to pink rectangle at (6, 4): 5
Distance from target shape to orange square at (2, 4): 3
Distance from target shape to purple rectangle at (4, 7): 2
Closest shape is the purple rectangle at (4, 7) with distance 2</think>

<answer>(4, 7)</answer>