There are 6 shapes on a 9x9 grid. Which shape is closest to the blue 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: blue square at (4, 5)
Distance from target shape to purple square at (1, 1): 7
Distance from target shape to green square at (5, 5): 1
Distance from target shape to cyan square at (1, 4): 4
Distance from target shape to pink rectangle at (6, 7): 4
Distance from target shape to yellow rectangle at (4, 1): 4
Closest shape is the green square at (5, 5) with distance 1</think>

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