There are 6 shapes on a 10x10 grid. Which shape is closest to the red 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: red rectangle at (6, 0)
Distance from target shape to brown square at (2, 5): 9
Distance from target shape to orange rectangle at (9, 9): 12
Distance from target shape to blue right_triangle at (9, 3): 6
Distance from target shape to pink trapezoid at (8, 4): 6
Distance from target shape to purple rectangle at (0, 9): 15
Closest shape is the blue right_triangle at (9, 3) with distance 6</think>

<answer>(9, 3)</answer>