There are 2 shapes on a 7x7 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, 4)
Distance from target shape to purple square at (3, 6): 5
Closest shape is the purple square at (3, 6) with distance 5</think>

<answer>(3, 6)</answer>