There are 3 shapes on a 9x9 grid. Which shape is closest to the pink 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: pink rectangle at (6, 4)
Distance from target shape to blue square at (5, 6): 3
Distance from target shape to red square at (3, 0): 7
Closest shape is the blue square at (5, 6) with distance 3</think>

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