There are 6 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 (5, 1)
Distance from target shape to green trapezoid at (4, 6): 6
Distance from target shape to purple right_triangle at (2, 8): 10
Distance from target shape to brown rectangle at (7, 3): 4
Distance from target shape to orange rectangle at (0, 6): 10
Distance from target shape to yellow right_triangle at (3, 5): 6
Closest shape is the brown rectangle at (7, 3) with distance 4</think>

<answer>(7, 3)</answer>