There are 4 shapes on a 9x9 grid. Which shape is closest to the pink 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: pink square at (5, 4)
Distance from target shape to green right_triangle at (6, 6): 3
Distance from target shape to red rectangle at (4, 4): 1
Distance from target shape to yellow rectangle at (1, 0): 8
Closest shape is the red rectangle at (4, 4) with distance 1</think>

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