There are 3 shapes on a 10x10 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 (8, 2)
Distance from target shape to orange square at (1, 3): 8
Distance from target shape to pink square at (0, 4): 10
Closest shape is the orange square at (1, 3) with distance 8</think>

<answer>(1, 3)</answer>