There are 6 shapes on a 9x9 grid. Which shape is closest to the brown right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: brown right_triangle at (4, 0)
Distance from target shape to pink right_triangle at (6, 6): 8
Distance from target shape to purple trapezoid at (2, 5): 7
Distance from target shape to gray trapezoid at (4, 5): 5
Distance from target shape to yellow right_triangle at (2, 3): 5
Distance from target shape to blue right_triangle at (5, 7): 8
Closest shape is the gray trapezoid at (4, 5) with distance 5</think>

<answer>(4, 5)</answer>