There are 3 shapes on a 9x9 grid. Which shape is closest to the blue 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: blue right_triangle at (7, 2)
Distance from target shape to brown trapezoid at (3, 6): 8
Distance from target shape to pink right_triangle at (7, 3): 1
Closest shape is the pink right_triangle at (7, 3) with distance 1</think>

<answer>(7, 3)</answer>