There are 3 shapes on a 4x4 grid. Which shape is closest to the red 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: red trapezoid at (3, 2)
Distance from target shape to pink trapezoid at (3, 1): 1
Distance from target shape to yellow rectangle at (0, 1): 4
Closest shape is the pink trapezoid at (3, 1) with distance 1</think>

<answer>(3, 1)</answer>