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 (2, 4)
Distance from target shape to purple trapezoid at (5, 4): 3
Distance from target shape to red trapezoid at (3, 7): 4
Distance from target shape to yellow trapezoid at (7, 8): 9
Distance from target shape to cyan right_triangle at (5, 0): 7
Distance from target shape to blue square at (0, 7): 5
Closest shape is the purple trapezoid at (5, 4) with distance 3</think>

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