There are 5 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 (3, 6)
Distance from target shape to pink trapezoid at (2, 7): 2
Distance from target shape to purple trapezoid at (7, 7): 5
Distance from target shape to yellow right_triangle at (5, 6): 2
Distance from target shape to blue square at (5, 8): 4
Closest shape is the pink trapezoid at (2, 7) with distance 2</think>

<answer>(2, 7)</answer>