There are 3 shapes on a 9x9 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 (6, 7)
Distance from target shape to pink right_triangle at (8, 8): 3
Distance from target shape to purple square at (0, 3): 10
Closest shape is the pink right_triangle at (8, 8) with distance 3</think>

<answer>(8, 8)</answer>