There are 6 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 (2, 3)
Distance from target shape to blue right_triangle at (0, 1): 4
Distance from target shape to brown square at (0, 3): 2
Distance from target shape to orange trapezoid at (1, 3): 1
Distance from target shape to cyan square at (4, 2): 3
Distance from target shape to red square at (6, 1): 6
Closest shape is the orange trapezoid at (1, 3) with distance 1</think>

<answer>(1, 3)</answer>