There are 3 shapes on a 5x5 grid. Which shape is closest to the green 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: green right_triangle at (4, 1)
Distance from target shape to brown right_triangle at (0, 4): 7
Distance from target shape to orange square at (3, 2): 2
Closest shape is the orange square at (3, 2) with distance 2</think>

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