There are 3 shapes on a 6x6 grid. Which shape is closest to the green trapezoid 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 trapezoid at (1, 5)
Distance from target shape to brown rectangle at (4, 5): 3
Distance from target shape to pink square at (4, 0): 8
Closest shape is the brown rectangle at (4, 5) with distance 3</think>

<answer>(4, 5)</answer>