There are 2 shapes on a 6x6 grid. Which shape is closest to the gray 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: gray trapezoid at (4, 1)
Distance from target shape to green square at (3, 1): 1
Closest shape is the green square at (3, 1) with distance 1</think>

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