There are 4 shapes on a 8x8 grid. Which shape is closest to the green rectangle 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 rectangle at (7, 6)
Distance from target shape to orange trapezoid at (5, 7): 3
Distance from target shape to blue trapezoid at (5, 1): 7
Distance from target shape to red trapezoid at (6, 5): 2
Closest shape is the red trapezoid at (6, 5) with distance 2</think>

<answer>(6, 5)</answer>