There are 6 shapes on a 10x10 grid. Which shape is closest to the brown 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: brown right_triangle at (2, 8)
Distance from target shape to blue right_triangle at (8, 5): 9
Distance from target shape to green trapezoid at (4, 5): 5
Distance from target shape to yellow square at (0, 8): 2
Distance from target shape to red right_triangle at (5, 8): 3
Distance from target shape to purple square at (3, 1): 8
Closest shape is the yellow square at (0, 8) with distance 2</think>

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