There are 3 shapes on a 6x6 grid. Which shape is closest to the green rectangle 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 rectangle at (3, 4)
Distance from target shape to orange rectangle at (4, 2): 3
Distance from target shape to brown right_triangle at (1, 1): 5
Closest shape is the orange rectangle at (4, 2) with distance 3</think>

<answer>(4, 2)</answer>