There are 3 shapes on a 7x7 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 (6, 3)
Distance from target shape to green square at (4, 5): 4
Distance from target shape to purple square at (3, 2): 4
Closest shape is the green square at (4, 5) with distance 4</think>

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