There are 5 shapes on a 10x10 grid. Which shape is closest to the yellow 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: yellow rectangle at (0, 9)
Distance from target shape to blue square at (5, 0): 14
Distance from target shape to pink square at (2, 1): 10
Distance from target shape to red square at (3, 8): 4
Distance from target shape to green right_triangle at (3, 0): 12
Closest shape is the red square at (3, 8) with distance 4</think>

<answer>(3, 8)</answer>