There are 3 shapes on a 10x10 grid. Which shape is closest to the blue right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: blue right_triangle at (7, 7)
Distance from target shape to pink rectangle at (3, 8): 5
Distance from target shape to orange right_triangle at (7, 9): 2
Closest shape is the orange right_triangle at (7, 9) with distance 2</think>

<answer>(7, 9)</answer>