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

<answer>(4, 7)</answer>