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 (1, 7)
Distance from target shape to purple rectangle at (4, 4): 6
Distance from target shape to yellow right_triangle at (0, 6): 2
Distance from target shape to blue rectangle at (0, 3): 5
Closest shape is the yellow right_triangle at (0, 6) with distance 2</think>

<answer>(0, 6)</answer>