There are 6 shapes on a 5x5 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 (1, 3)
Distance from target shape to gray rectangle at (3, 3): 2
Distance from target shape to pink rectangle at (3, 0): 5
Distance from target shape to yellow trapezoid at (2, 2): 2
Distance from target shape to blue trapezoid at (2, 1): 3
Distance from target shape to cyan square at (3, 2): 3
Closest shape is the gray rectangle at (3, 3) with distance 2</think>

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