There are 3 shapes on a 8x8 grid. Which shape is closest to the pink 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: pink trapezoid at (1, 7)
Distance from target shape to purple square at (6, 7): 5
Distance from target shape to cyan trapezoid at (6, 5): 7
Closest shape is the purple square at (6, 7) with distance 5</think>

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