There are 3 shapes on a 9x9 grid. Which shape is closest to the gray 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: gray right_triangle at (3, 5)
Distance from target shape to purple right_triangle at (0, 4): 4
Distance from target shape to red right_triangle at (6, 4): 4
Closest shape is the purple right_triangle at (0, 4) with distance 4</think>

<answer>(0, 4)</answer>