There are 3 shapes on a 3x3 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 (0, 2)
Distance from target shape to cyan rectangle at (1, 1): 2
Distance from target shape to purple right_triangle at (0, 1): 1
Closest shape is the purple right_triangle at (0, 1) with distance 1</think>

<answer>(0, 1)</answer>