There are 3 shapes on a 9x9 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 (8, 1)
Distance from target shape to red rectangle at (3, 8): 12
Distance from target shape to yellow square at (7, 1): 1
Closest shape is the yellow square at (7, 1) with distance 1</think>

<answer>(7, 1)</answer>