There are 4 shapes on a 9x9 grid. Which shape is closest to the gray 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: gray right_triangle at (6, 7)
Distance from target shape to blue trapezoid at (7, 6): 2
Distance from target shape to orange rectangle at (0, 4): 9
Distance from target shape to purple right_triangle at (8, 4): 5
Closest shape is the blue trapezoid at (7, 6) with distance 2</think>

<answer>(7, 6)</answer>