There are 4 shapes on a 10x10 grid. Which shape is closest to the red 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: red rectangle at (0, 8)
Distance from target shape to gray right_triangle at (7, 1): 14
Distance from target shape to purple square at (2, 2): 8
Distance from target shape to pink square at (5, 7): 6
Closest shape is the pink square at (5, 7) with distance 6</think>

<answer>(5, 7)</answer>