There are 4 shapes on a 9x9 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 (8, 7)
Distance from target shape to orange square at (2, 5): 8
Distance from target shape to pink right_triangle at (8, 1): 6
Distance from target shape to yellow square at (3, 2): 10
Closest shape is the pink right_triangle at (8, 1) with distance 6</think>

<answer>(8, 1)</answer>