There are 4 shapes on a 6x6 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 (0, 3)
Distance from target shape to green square at (5, 5): 7
Distance from target shape to brown rectangle at (3, 4): 4
Distance from target shape to red rectangle at (5, 0): 8
Closest shape is the brown rectangle at (3, 4) with distance 4</think>

<answer>(3, 4)</answer>