There are 5 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 (0, 3)
Distance from target shape to orange trapezoid at (3, 2): 4
Distance from target shape to pink right_triangle at (1, 0): 4
Distance from target shape to gray right_triangle at (2, 3): 2
Distance from target shape to brown trapezoid at (1, 3): 1
Closest shape is the brown trapezoid at (1, 3) with distance 1</think>

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