There are 6 shapes on a 8x8 grid. Which shape is closest to the purple trapezoid 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 trapezoid at (4, 5)
Distance from target shape to green rectangle at (4, 3): 2
Distance from target shape to blue trapezoid at (1, 6): 4
Distance from target shape to brown rectangle at (2, 1): 6
Distance from target shape to pink right_triangle at (6, 2): 5
Distance from target shape to cyan rectangle at (2, 6): 3
Closest shape is the green rectangle at (4, 3) with distance 2</think>

<answer>(4, 3)</answer>