There are 5 shapes on a 8x8 grid. Which shape is closest to the pink right_triangle 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 right_triangle at (0, 6)
Distance from target shape to purple rectangle at (0, 7): 1
Distance from target shape to gray rectangle at (2, 1): 7
Distance from target shape to red rectangle at (6, 7): 7
Distance from target shape to brown right_triangle at (3, 0): 9
Closest shape is the purple rectangle at (0, 7) with distance 1</think>

<answer>(0, 7)</answer>