There are 5 shapes on a 9x9 grid. Which shape is closest to the pink 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: pink right_triangle at (3, 6)
Distance from target shape to orange trapezoid at (4, 3): 4
Distance from target shape to green trapezoid at (2, 4): 3
Distance from target shape to cyan right_triangle at (8, 7): 6
Distance from target shape to purple right_triangle at (4, 2): 5
Closest shape is the green trapezoid at (2, 4) with distance 3</think>

<answer>(2, 4)</answer>