There are 5 shapes on a 10x10 grid. Which shape is closest to the yellow 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: yellow square at (8, 1)
Distance from target shape to orange rectangle at (0, 3): 10
Distance from target shape to blue right_triangle at (3, 3): 7
Distance from target shape to green right_triangle at (4, 7): 10
Distance from target shape to pink square at (8, 6): 5
Closest shape is the pink square at (8, 6) with distance 5</think>

<answer>(8, 6)</answer>