There are 3 shapes on a 5x5 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 (1, 2)
Distance from target shape to purple right_triangle at (1, 3): 1
Distance from target shape to red trapezoid at (3, 4): 4
Closest shape is the purple right_triangle at (1, 3) with distance 1</think>

<answer>(1, 3)</answer>