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 (0, 1)
Distance from target shape to gray trapezoid at (2, 3): 4
Distance from target shape to blue trapezoid at (0, 4): 3
Closest shape is the blue trapezoid at (0, 4) with distance 3</think>

<answer>(0, 4)</answer>