There are 4 shapes on a 9x9 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 (2, 5)
Distance from target shape to red right_triangle at (6, 2): 7
Distance from target shape to yellow square at (5, 8): 6
Distance from target shape to gray rectangle at (3, 8): 4
Closest shape is the gray rectangle at (3, 8) with distance 4</think>

<answer>(3, 8)</answer>