There are 4 shapes on a 9x9 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 (2, 0)
Distance from target shape to purple square at (1, 6): 7
Distance from target shape to green square at (7, 2): 7
Distance from target shape to red right_triangle at (7, 8): 13
Closest shape is the purple square at (1, 6) with distance 7</think>

<answer>(1, 6)</answer>