There are 4 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 (7, 6)
Distance from target shape to gray trapezoid at (0, 7): 8
Distance from target shape to purple square at (5, 6): 2
Distance from target shape to green right_triangle at (4, 7): 4
Closest shape is the purple square at (5, 6) with distance 2</think>

<answer>(5, 6)</answer>