There are 3 shapes on a 10x10 grid. Which shape is closest to the purple 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: purple trapezoid at (1, 9)
Distance from target shape to pink right_triangle at (4, 6): 6
Distance from target shape to red rectangle at (8, 6): 10
Closest shape is the pink right_triangle at (4, 6) with distance 6</think>

<answer>(4, 6)</answer>