There are 5 shapes on a 8x8 grid. Which shape is closest to the pink 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: pink square at (3, 7)
Distance from target shape to red square at (2, 0): 8
Distance from target shape to orange square at (1, 5): 4
Distance from target shape to green square at (4, 2): 6
Distance from target shape to gray rectangle at (4, 5): 3
Closest shape is the gray rectangle at (4, 5) with distance 3</think>

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