There are 4 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, 4)
Distance from target shape to red trapezoid at (3, 2): 3
Distance from target shape to gray trapezoid at (2, 1): 5
Distance from target shape to yellow trapezoid at (4, 1): 3
Closest shape is the red trapezoid at (3, 2) with distance 3</think>

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