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 (2, 2)
Distance from target shape to blue square at (3, 4): 3
Distance from target shape to red trapezoid at (4, 1): 3
Distance from target shape to orange square at (4, 4): 4
Distance from target shape to pink right_triangle at (3, 1): 2
Distance from target shape to green square at (3, 2): 1
Closest shape is the green square at (3, 2) with distance 1</think>

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