There are 5 shapes on a 4x4 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, 3)
Distance from target shape to blue square at (2, 3): 1
Distance from target shape to pink trapezoid at (1, 3): 2
Distance from target shape to orange right_triangle at (1, 2): 3
Distance from target shape to red rectangle at (2, 0): 4
Closest shape is the blue square at (2, 3) with distance 1</think>

<answer>(2, 3)</answer>