There are 5 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 (2, 4)
Distance from target shape to pink rectangle at (5, 3): 4
Distance from target shape to purple rectangle at (5, 7): 6
Distance from target shape to green right_triangle at (9, 7): 10
Distance from target shape to red trapezoid at (7, 4): 5
Closest shape is the pink rectangle at (5, 3) with distance 4</think>

<answer>(5, 3)</answer>