There are 5 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, 5)
Distance from target shape to cyan rectangle at (5, 5): 5
Distance from target shape to purple trapezoid at (3, 3): 5
Distance from target shape to yellow rectangle at (1, 3): 3
Distance from target shape to red trapezoid at (3, 5): 3
Closest shape is the yellow rectangle at (1, 3) with distance 3</think>

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