There are 6 shapes on a 7x7 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 (0, 6)
Distance from target shape to purple square at (5, 1): 10
Distance from target shape to gray trapezoid at (3, 5): 4
Distance from target shape to cyan right_triangle at (3, 4): 5
Distance from target shape to orange square at (4, 3): 7
Distance from target shape to yellow square at (5, 6): 5
Closest shape is the gray trapezoid at (3, 5) with distance 4</think>

<answer>(3, 5)</answer>