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

<answer>(3, 3)</answer>