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 (0, 2)
Distance from target shape to blue right_triangle at (1, 3): 2
Distance from target shape to yellow right_triangle at (3, 0): 5
Distance from target shape to cyan square at (2, 3): 3
Distance from target shape to orange trapezoid at (2, 0): 4
Closest shape is the blue right_triangle at (1, 3) with distance 2</think>

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