There are 6 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 (2, 3)
Distance from target shape to green right_triangle at (3, 2): 2
Distance from target shape to gray rectangle at (2, 0): 3
Distance from target shape to red square at (0, 2): 3
Distance from target shape to purple trapezoid at (3, 0): 4
Distance from target shape to blue trapezoid at (1, 3): 1
Closest shape is the blue trapezoid at (1, 3) with distance 1</think>

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