There are 3 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, 6)
Distance from target shape to brown right_triangle at (0, 7): 5
Distance from target shape to pink trapezoid at (7, 6): 3
Closest shape is the pink trapezoid at (7, 6) with distance 3</think>

<answer>(7, 6)</answer>