There are 3 shapes on a 9x9 grid. Which shape is closest to the green trapezoid in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green trapezoid at (6, 1)
Distance from target shape to blue right_triangle at (0, 8): 13
Distance from target shape to pink trapezoid at (1, 6): 10
Closest shape is the pink trapezoid at (1, 6) with distance 10</think>

<answer>(1, 6)</answer>