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 (4, 2)
Distance from target shape to pink trapezoid at (0, 4): 6
Distance from target shape to gray rectangle at (1, 4): 5
Distance from target shape to purple right_triangle at (4, 4): 2
Closest shape is the purple right_triangle at (4, 4) with distance 2</think>

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