There are 2 shapes on a 9x9 grid. Which shape is closest to the purple 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: purple right_triangle at (1, 4)
Distance from target shape to orange right_triangle at (3, 4): 2
Closest shape is the orange right_triangle at (3, 4) with distance 2</think>

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