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

<answer>(4, 6)</answer>