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

<answer>(3, 1)</answer>