There are 4 shapes on a 3x3 grid. Which shape is closest to the purple 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: purple trapezoid at (2, 2)
Distance from target shape to cyan square at (0, 2): 2
Distance from target shape to gray trapezoid at (1, 1): 2
Distance from target shape to green trapezoid at (1, 2): 1
Closest shape is the green trapezoid at (1, 2) with distance 1</think>

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