There are 6 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 (4, 4)
Distance from target shape to gray rectangle at (4, 1): 3
Distance from target shape to orange trapezoid at (6, 1): 5
Distance from target shape to purple right_triangle at (3, 2): 3
Distance from target shape to pink rectangle at (7, 3): 4
Distance from target shape to brown rectangle at (0, 4): 4
Closest shape is the gray rectangle at (4, 1) with distance 3</think>

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