There are 3 shapes on a 10x10 grid. Which shape is closest to the green 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: green trapezoid at (5, 5)
Distance from target shape to gray trapezoid at (1, 8): 7
Distance from target shape to yellow trapezoid at (5, 8): 3
Closest shape is the yellow trapezoid at (5, 8) with distance 3</think>

<answer>(5, 8)</answer>