There are 6 shapes on a 8x8 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 (3, 2)
Distance from target shape to brown square at (7, 1): 5
Distance from target shape to blue right_triangle at (1, 4): 4
Distance from target shape to green rectangle at (1, 2): 2
Distance from target shape to orange square at (5, 5): 5
Distance from target shape to pink trapezoid at (1, 0): 4
Closest shape is the green rectangle at (1, 2) with distance 2</think>

<answer>(1, 2)</answer>