There are 4 shapes on a 9x9 grid. Which shape is closest to the blue 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: blue trapezoid at (8, 1)
Distance from target shape to purple right_triangle at (4, 7): 10
Distance from target shape to cyan square at (1, 4): 10
Distance from target shape to green trapezoid at (2, 1): 6
Closest shape is the green trapezoid at (2, 1) with distance 6</think>

<answer>(2, 1)</answer>