There are 5 shapes on a 9x9 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 (6, 6)
Distance from target shape to orange right_triangle at (0, 1): 11
Distance from target shape to brown right_triangle at (3, 4): 5
Distance from target shape to red rectangle at (8, 5): 3
Distance from target shape to purple square at (4, 7): 3
Closest shape is the red rectangle at (8, 5) with distance 3</think>

<answer>(8, 5)</answer>