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

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