There are 4 shapes on a 9x9 grid. Which shape is closest to the yellow 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: yellow right_triangle at (5, 6)
Distance from target shape to blue rectangle at (3, 8): 4
Distance from target shape to purple trapezoid at (2, 2): 7
Distance from target shape to brown trapezoid at (7, 7): 3
Closest shape is the brown trapezoid at (7, 7) with distance 3</think>

<answer>(7, 7)</answer>