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 (5, 0)
Distance from target shape to blue square at (3, 4): 6
Distance from target shape to cyan rectangle at (0, 5): 10
Distance from target shape to gray trapezoid at (3, 5): 7
Distance from target shape to pink right_triangle at (2, 0): 3
Closest shape is the pink right_triangle at (2, 0) with distance 3</think>

<answer>(2, 0)</answer>