There are 5 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 (6, 3)
Distance from target shape to pink right_triangle at (2, 6): 7
Distance from target shape to orange trapezoid at (7, 2): 2
Distance from target shape to yellow square at (5, 1): 3
Distance from target shape to green right_triangle at (7, 6): 4
Closest shape is the orange trapezoid at (7, 2) with distance 2</think>

<answer>(7, 2)</answer>