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

<answer>(4, 1)</answer>