There are 6 shapes on a 5x5 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 (4, 3)
Distance from target shape to red trapezoid at (3, 1): 3
Distance from target shape to gray square at (0, 2): 5
Distance from target shape to purple rectangle at (2, 1): 4
Distance from target shape to brown trapezoid at (2, 2): 3
Distance from target shape to blue right_triangle at (0, 1): 6
Closest shape is the red trapezoid at (3, 1) with distance 3</think>

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