There are 3 shapes on a 10x10 grid. Which shape is closest to the red square 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 square at (5, 7)
Distance from target shape to green rectangle at (6, 7): 1
Distance from target shape to blue rectangle at (5, 8): 1
Closest shape is the green rectangle at (6, 7) with distance 1</think>

<answer>(6, 7)</answer>