There are 3 shapes on a 9x9 grid. Which shape is closest to the green 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: green square at (1, 5)
Distance from target shape to red right_triangle at (4, 8): 6
Distance from target shape to yellow right_triangle at (0, 7): 3
Closest shape is the yellow right_triangle at (0, 7) with distance 3</think>

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