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 (3, 8)
Distance from target shape to yellow trapezoid at (5, 3): 7
Distance from target shape to brown right_triangle at (4, 6): 3
Closest shape is the brown right_triangle at (4, 6) with distance 3</think>

<answer>(4, 6)</answer>