There are 4 shapes on a 10x10 grid. Which shape is closest to the red 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: red trapezoid at (8, 1)
Distance from target shape to gray square at (0, 3): 10
Distance from target shape to pink right_triangle at (1, 7): 13
Distance from target shape to green rectangle at (9, 4): 4
Closest shape is the green rectangle at (9, 4) with distance 4</think>

<answer>(9, 4)</answer>