There are 6 shapes on a 9x9 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 (0, 1)
Distance from target shape to green square at (7, 7): 13
Distance from target shape to blue rectangle at (6, 8): 13
Distance from target shape to red rectangle at (7, 5): 11
Distance from target shape to pink trapezoid at (5, 8): 12
Distance from target shape to purple right_triangle at (6, 0): 7
Closest shape is the purple right_triangle at (6, 0) with distance 7</think>

<answer>(6, 0)</answer>