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

<answer>(7, 7)</answer>