There are 6 shapes on a 5x5 grid. Which shape is closest to the green square 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 square at (3, 3)
Distance from target shape to pink trapezoid at (0, 3): 3
Distance from target shape to red square at (2, 3): 1
Distance from target shape to blue trapezoid at (1, 2): 3
Distance from target shape to purple trapezoid at (0, 2): 4
Distance from target shape to gray right_triangle at (3, 0): 3
Closest shape is the red square at (2, 3) with distance 1</think>

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