There are 5 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, 3)
Distance from target shape to purple square at (0, 3): 1
Distance from target shape to brown right_triangle at (0, 2): 2
Distance from target shape to red rectangle at (4, 2): 4
Distance from target shape to pink square at (4, 4): 4
Closest shape is the purple square at (0, 3) with distance 1</think>

<answer>(0, 3)</answer>