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

<answer>(2, 3)</answer>