There are 4 shapes on a 6x6 grid. Which shape is closest to the yellow 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: yellow rectangle at (5, 3)
Distance from target shape to pink square at (1, 5): 6
Distance from target shape to blue rectangle at (5, 0): 3
Distance from target shape to purple square at (0, 0): 8
Closest shape is the blue rectangle at (5, 0) with distance 3</think>

<answer>(5, 0)</answer>