There are 4 shapes on a 10x10 grid. Which shape is closest to the yellow 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: yellow right_triangle at (8, 5)
Distance from target shape to gray square at (1, 8): 10
Distance from target shape to blue trapezoid at (9, 6): 2
Distance from target shape to pink trapezoid at (3, 1): 9
Closest shape is the blue trapezoid at (9, 6) with distance 2</think>

<answer>(9, 6)</answer>