There are 4 shapes on a 9x9 grid. Which shape is closest to the green square 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 square at (4, 0)
Distance from target shape to orange trapezoid at (8, 1): 5
Distance from target shape to purple rectangle at (8, 3): 7
Distance from target shape to blue trapezoid at (8, 8): 12
Closest shape is the orange trapezoid at (8, 1) with distance 5</think>

<answer>(8, 1)</answer>