There are 2 shapes on a 8x8 grid. Which shape is closest to the green 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: green right_triangle at (3, 3)
Distance from target shape to gray trapezoid at (4, 6): 4
Closest shape is the gray trapezoid at (4, 6) with distance 4</think>

<answer>(4, 6)</answer>