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 (6, 0)
Distance from target shape to brown square at (6, 3): 3
Distance from target shape to red trapezoid at (6, 5): 5
Distance from target shape to blue rectangle at (7, 3): 4
Closest shape is the brown square at (6, 3) with distance 3</think>

<answer>(6, 3)</answer>