There are 3 shapes on a 9x9 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, 4)
Distance from target shape to blue square at (8, 4): 3
Distance from target shape to purple trapezoid at (0, 5): 6
Closest shape is the blue square at (8, 4) with distance 3</think>

<answer>(8, 4)</answer>