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 (5, 6)
Distance from target shape to red rectangle at (3, 6): 2
Distance from target shape to orange right_triangle at (0, 7): 6
Distance from target shape to brown right_triangle at (1, 2): 8
Closest shape is the red rectangle at (3, 6) with distance 2</think>

<answer>(3, 6)</answer>