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, 3)
Distance from target shape to yellow square at (5, 5): 4
Distance from target shape to red trapezoid at (1, 7): 6
Distance from target shape to blue trapezoid at (7, 3): 4
Distance from target shape to cyan trapezoid at (7, 5): 6
Distance from target shape to pink square at (0, 6): 6
Closest shape is the yellow square at (5, 5) with distance 4</think>

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