There are 5 shapes on a 9x9 grid. Which shape is closest to the cyan 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: cyan right_triangle at (8, 0)
Distance from target shape to blue right_triangle at (5, 1): 4
Distance from target shape to orange rectangle at (3, 8): 13
Distance from target shape to pink right_triangle at (0, 5): 13
Distance from target shape to green square at (3, 0): 5
Closest shape is the blue right_triangle at (5, 1) with distance 4</think>

<answer>(5, 1)</answer>