There are 6 shapes on a 6x6 grid. Which shape is closest to the green square 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 square at (0, 3)
Distance from target shape to cyan trapezoid at (4, 0): 7
Distance from target shape to purple rectangle at (0, 0): 3
Distance from target shape to orange trapezoid at (5, 2): 6
Distance from target shape to pink trapezoid at (1, 3): 1
Distance from target shape to gray rectangle at (5, 4): 6
Closest shape is the pink trapezoid at (1, 3) with distance 1</think>

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