There are 5 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 (0, 4)
Distance from target shape to purple rectangle at (2, 1): 5
Distance from target shape to gray rectangle at (8, 4): 8
Distance from target shape to cyan trapezoid at (5, 6): 7
Distance from target shape to pink square at (8, 5): 9
Closest shape is the purple rectangle at (2, 1) with distance 5</think>

<answer>(2, 1)</answer>