There are 3 shapes on a 10x10 grid. Which shape is closest to the purple 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: purple trapezoid at (8, 8)
Distance from target shape to green right_triangle at (0, 6): 10
Distance from target shape to red right_triangle at (2, 8): 6
Closest shape is the red right_triangle at (2, 8) with distance 6</think>

<answer>(2, 8)</answer>