There are 5 shapes on a 4x4 grid. Which shape is closest to the purple 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: purple square at (3, 3)
Distance from target shape to green square at (0, 2): 4
Distance from target shape to red rectangle at (0, 3): 3
Distance from target shape to orange rectangle at (0, 0): 6
Distance from target shape to brown square at (2, 3): 1
Closest shape is the brown square at (2, 3) with distance 1</think>

<answer>(2, 3)</answer>