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 (8, 7)
Distance from target shape to purple right_triangle at (5, 8): 4
Distance from target shape to yellow trapezoid at (4, 1): 10
Distance from target shape to red square at (0, 7): 8
Closest shape is the purple right_triangle at (5, 8) with distance 4</think>

<answer>(5, 8)</answer>