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

<answer>(1, 4)</answer>