There are 2 shapes on a 7x7 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 (1, 3)
Distance from target shape to cyan rectangle at (4, 5): 5
Closest shape is the cyan rectangle at (4, 5) with distance 5</think>

<answer>(4, 5)</answer>