There are 4 shapes on a 5x5 grid. Which shape is closest to the green 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: green rectangle at (4, 3)
Distance from target shape to purple trapezoid at (0, 1): 6
Distance from target shape to cyan right_triangle at (3, 1): 3
Distance from target shape to blue rectangle at (3, 2): 2
Closest shape is the blue rectangle at (3, 2) with distance 2</think>

<answer>(3, 2)</answer>