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 (2, 1)
Distance from target shape to yellow right_triangle at (1, 3): 3
Distance from target shape to brown right_triangle at (5, 6): 8
Distance from target shape to pink trapezoid at (4, 1): 2
Closest shape is the pink trapezoid at (4, 1) with distance 2</think>

<answer>(4, 1)</answer>