There are 2 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue right_triangle at (7, 7)
Distance from target shape to purple trapezoid at (4, 5): 5
Closest shape is the purple trapezoid at (4, 5) with distance 5</think>

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