There are 6 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 (0, 8)
Distance from target shape to pink square at (4, 5): 7
Distance from target shape to green rectangle at (3, 1): 10
Distance from target shape to yellow square at (7, 5): 10
Distance from target shape to red square at (3, 0): 11
Distance from target shape to cyan right_triangle at (0, 1): 7
Closest shape is the pink square at (4, 5) with distance 7</think>

<answer>(4, 5)</answer>