There are 4 shapes on a 9x9 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 (3, 7)
Distance from target shape to pink trapezoid at (6, 3): 7
Distance from target shape to blue right_triangle at (8, 0): 12
Distance from target shape to gray right_triangle at (1, 5): 4
Closest shape is the gray right_triangle at (1, 5) with distance 4</think>

<answer>(1, 5)</answer>