There are 6 shapes on a 9x9 grid. Which shape is closest to the purple 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: purple rectangle at (6, 1)
Distance from target shape to orange trapezoid at (3, 3): 5
Distance from target shape to gray square at (7, 8): 8
Distance from target shape to green square at (7, 6): 6
Distance from target shape to brown right_triangle at (0, 6): 11
Distance from target shape to cyan square at (4, 6): 7
Closest shape is the orange trapezoid at (3, 3) with distance 5</think>

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