There are 3 shapes on a 6x6 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 (2, 2)
Distance from target shape to brown trapezoid at (5, 3): 4
Distance from target shape to purple rectangle at (2, 5): 3
Closest shape is the purple rectangle at (2, 5) with distance 3</think>

<answer>(2, 5)</answer>