There are 4 shapes on a 6x6 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, 1)
Distance from target shape to orange right_triangle at (0, 3): 2
Distance from target shape to brown trapezoid at (0, 0): 1
Distance from target shape to pink rectangle at (3, 3): 5
Closest shape is the brown trapezoid at (0, 0) with distance 1</think>

<answer>(0, 0)</answer>