There are 5 shapes on a 9x9 grid. Which shape is closest to the blue 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: blue rectangle at (6, 8)
Distance from target shape to purple trapezoid at (8, 2): 8
Distance from target shape to yellow right_triangle at (6, 5): 3
Distance from target shape to gray rectangle at (1, 3): 10
Distance from target shape to pink rectangle at (2, 4): 8
Closest shape is the yellow right_triangle at (6, 5) with distance 3</think>

<answer>(6, 5)</answer>