There are 5 shapes on a 10x10 grid. Which shape is closest to the green rectangle 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 rectangle at (9, 4)
Distance from target shape to pink rectangle at (6, 9): 8
Distance from target shape to brown square at (6, 0): 7
Distance from target shape to purple rectangle at (8, 4): 1
Distance from target shape to red square at (5, 8): 8
Closest shape is the purple rectangle at (8, 4) with distance 1</think>

<answer>(8, 4)</answer>