There are 4 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray square at (0, 3)
Distance from target shape to orange square at (2, 1): 4
Distance from target shape to green rectangle at (0, 6): 3
Distance from target shape to purple rectangle at (4, 9): 10
Closest shape is the green rectangle at (0, 6) with distance 3</think>

<answer>(0, 6)</answer>