There are 6 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, 3)
Distance from target shape to red right_triangle at (4, 3): 3
Distance from target shape to cyan square at (4, 8): 8
Distance from target shape to green trapezoid at (5, 0): 5
Distance from target shape to purple square at (4, 2): 4
Distance from target shape to orange rectangle at (6, 0): 4
Closest shape is the red right_triangle at (4, 3) with distance 3</think>

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