There are 3 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 (2, 8)
Distance from target shape to blue square at (4, 3): 7
Distance from target shape to purple square at (7, 1): 12
Closest shape is the blue square at (4, 3) with distance 7</think>

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