There are 3 shapes on a 5x5 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 (4, 0)
Distance from target shape to yellow rectangle at (2, 1): 3
Distance from target shape to pink right_triangle at (0, 2): 6
Closest shape is the yellow rectangle at (2, 1) with distance 3</think>

<answer>(2, 1)</answer>