There are 5 shapes on a 7x7 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 (0, 3)
Distance from target shape to brown right_triangle at (1, 2): 2
Distance from target shape to orange square at (6, 0): 9
Distance from target shape to red rectangle at (2, 3): 2
Distance from target shape to gray square at (0, 6): 3
Closest shape is the brown right_triangle at (1, 2) with distance 2</think>

<answer>(1, 2)</answer>