There are 6 shapes on a 5x5 grid. Which shape is closest to the purple square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: purple square at (4, 4)
Distance from target shape to brown square at (2, 1): 5
Distance from target shape to green right_triangle at (4, 2): 2
Distance from target shape to orange right_triangle at (0, 4): 4
Distance from target shape to pink rectangle at (4, 3): 1
Distance from target shape to red rectangle at (2, 3): 3
Closest shape is the pink rectangle at (4, 3) with distance 1</think>

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