There are 6 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 (2, 5)
Distance from target shape to purple trapezoid at (5, 4): 4
Distance from target shape to cyan right_triangle at (0, 3): 4
Distance from target shape to yellow rectangle at (4, 1): 6
Distance from target shape to red rectangle at (7, 3): 7
Distance from target shape to pink trapezoid at (7, 8): 8
Closest shape is the purple trapezoid at (5, 4) with distance 4</think>

<answer>(5, 4)</answer>