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

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