There are 5 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 (5, 1)
Distance from target shape to orange square at (0, 4): 8
Distance from target shape to pink square at (1, 0): 5
Distance from target shape to brown rectangle at (4, 0): 2
Distance from target shape to yellow square at (1, 2): 5
Closest shape is the brown rectangle at (4, 0) with distance 2</think>

<answer>(4, 0)</answer>