There are 3 shapes on a 8x8 grid. Which shape is closest to the yellow 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: yellow trapezoid at (1, 7)
Distance from target shape to green square at (0, 4): 4
Distance from target shape to purple square at (6, 4): 8
Closest shape is the green square at (0, 4) with distance 4</think>

<answer>(0, 4)</answer>