There are 6 shapes on a 6x6 grid. Which shape is closest to the green rectangle 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 rectangle at (5, 3)
Distance from target shape to cyan rectangle at (3, 2): 3
Distance from target shape to orange rectangle at (0, 0): 8
Distance from target shape to purple square at (4, 5): 3
Distance from target shape to red right_triangle at (0, 4): 6
Distance from target shape to blue rectangle at (2, 0): 6
Closest shape is the cyan rectangle at (3, 2) with distance 3</think>

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