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 (7, 6)
Distance from target shape to red right_triangle at (2, 3): 8
Distance from target shape to purple right_triangle at (4, 3): 6
Distance from target shape to brown right_triangle at (0, 4): 9
Closest shape is the purple right_triangle at (4, 3) with distance 6</think>

<answer>(4, 3)</answer>