There are 2 shapes on a 8x8 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 (6, 2)
Distance from target shape to blue right_triangle at (4, 6): 6
Closest shape is the blue right_triangle at (4, 6) with distance 6</think>

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