There are 6 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, 7)
Distance from target shape to gray rectangle at (1, 6): 3
Distance from target shape to purple right_triangle at (8, 3): 9
Distance from target shape to brown right_triangle at (0, 1): 9
Distance from target shape to red trapezoid at (0, 6): 4
Distance from target shape to green right_triangle at (2, 6): 2
Closest shape is the green right_triangle at (2, 6) with distance 2</think>

<answer>(2, 6)</answer>