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

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