There are 3 shapes on a 6x6 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 (5, 5)
Distance from target shape to purple rectangle at (3, 0): 7
Distance from target shape to yellow rectangle at (0, 4): 6
Closest shape is the yellow rectangle at (0, 4) with distance 6</think>

<answer>(0, 4)</answer>