There are 5 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 (2, 9)
Distance from target shape to red trapezoid at (2, 1): 8
Distance from target shape to purple right_triangle at (6, 3): 10
Distance from target shape to blue rectangle at (2, 3): 6
Distance from target shape to gray right_triangle at (4, 3): 8
Closest shape is the blue rectangle at (2, 3) with distance 6</think>

<answer>(2, 3)</answer>