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

<answer>(2, 4)</answer>