There are 4 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue trapezoid at (3, 7)
Distance from target shape to orange trapezoid at (6, 5): 5
Distance from target shape to purple rectangle at (7, 6): 5
Distance from target shape to red right_triangle at (2, 1): 7
Closest shape is the orange trapezoid at (6, 5) with distance 5</think>

<answer>(6, 5)</answer>