There are 6 shapes on a 9x9 grid. Which shape is closest to the gray 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: gray right_triangle at (5, 0)
Distance from target shape to red trapezoid at (3, 7): 9
Distance from target shape to green right_triangle at (1, 4): 8
Distance from target shape to cyan trapezoid at (7, 3): 5
Distance from target shape to purple trapezoid at (6, 5): 6
Distance from target shape to pink trapezoid at (7, 8): 10
Closest shape is the cyan trapezoid at (7, 3) with distance 5</think>

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