There are 5 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, 5)
Distance from target shape to brown right_triangle at (0, 1): 10
Distance from target shape to purple trapezoid at (8, 5): 2
Distance from target shape to cyan trapezoid at (4, 6): 3
Distance from target shape to pink square at (1, 1): 9
Closest shape is the purple trapezoid at (8, 5) with distance 2</think>

<answer>(8, 5)</answer>