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 (1, 6)
Distance from target shape to gray right_triangle at (0, 8): 3
Distance from target shape to orange trapezoid at (7, 4): 8
Closest shape is the gray right_triangle at (0, 8) with distance 3</think>

<answer>(0, 8)</answer>