There are 4 shapes on a 9x9 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, 2)
Distance from target shape to blue right_triangle at (6, 0): 3
Distance from target shape to green trapezoid at (3, 3): 3
Distance from target shape to yellow square at (8, 1): 4
Closest shape is the blue right_triangle at (6, 0) with distance 3</think>

<answer>(6, 0)</answer>