There are 3 shapes on a 4x4 grid. Which shape is closest to the green 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: green trapezoid at (3, 0)
Distance from target shape to blue rectangle at (0, 1): 4
Distance from target shape to pink trapezoid at (0, 3): 6
Closest shape is the blue rectangle at (0, 1) with distance 4</think>

<answer>(0, 1)</answer>