There are 4 shapes on a 9x9 grid. Which shape is closest to the red trapezoid 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 trapezoid at (6, 4)
Distance from target shape to yellow square at (3, 1): 6
Distance from target shape to blue right_triangle at (4, 4): 2
Distance from target shape to pink trapezoid at (6, 2): 2
Closest shape is the blue right_triangle at (4, 4) with distance 2</think>

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