There are 3 shapes on a 10x10 grid. Which shape is closest to the gray rectangle 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 rectangle at (6, 0)
Distance from target shape to red right_triangle at (9, 8): 11
Distance from target shape to blue right_triangle at (9, 0): 3
Closest shape is the blue right_triangle at (9, 0) with distance 3</think>

<answer>(9, 0)</answer>