There are 5 shapes on a 10x10 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, 8)
Distance from target shape to pink rectangle at (4, 9): 1
Distance from target shape to brown rectangle at (9, 9): 6
Distance from target shape to gray trapezoid at (7, 1): 10
Distance from target shape to red trapezoid at (8, 5): 7
Closest shape is the pink rectangle at (4, 9) with distance 1</think>

<answer>(4, 9)</answer>