There are 4 shapes on a 10x10 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 (1, 6)
Distance from target shape to purple trapezoid at (7, 5): 7
Distance from target shape to pink rectangle at (3, 6): 2
Distance from target shape to orange rectangle at (4, 2): 7
Closest shape is the pink rectangle at (3, 6) with distance 2</think>

<answer>(3, 6)</answer>