There are 3 shapes on a 9x9 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 (8, 1)
Distance from target shape to pink trapezoid at (2, 1): 6
Distance from target shape to green square at (4, 0): 5
Closest shape is the green square at (4, 0) with distance 5</think>

<answer>(4, 0)</answer>