There are 3 shapes on a 10x10 grid. Which shape is closest to the orange 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: orange right_triangle at (5, 3)
Distance from target shape to red trapezoid at (4, 9): 7
Distance from target shape to blue right_triangle at (1, 9): 10
Closest shape is the red trapezoid at (4, 9) with distance 7</think>

<answer>(4, 9)</answer>