There are 6 shapes on a 7x7 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 (0, 6)
Distance from target shape to blue right_triangle at (4, 5): 5
Distance from target shape to pink trapezoid at (3, 2): 7
Distance from target shape to cyan right_triangle at (5, 1): 10
Distance from target shape to purple trapezoid at (5, 4): 7
Distance from target shape to green right_triangle at (3, 4): 5
Closest shape is the blue right_triangle at (4, 5) with distance 5</think>

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