There are 2 shapes on a 9x9 grid. Which shape is closest to the red 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: red right_triangle at (1, 4)
Distance from target shape to yellow trapezoid at (5, 8): 8
Closest shape is the yellow trapezoid at (5, 8) with distance 8</think>

<answer>(5, 8)</answer>