There are 4 shapes on a 10x10 grid. Which shape is closest to the red 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: red right_triangle at (7, 7)
Distance from target shape to brown right_triangle at (4, 2): 8
Distance from target shape to yellow trapezoid at (7, 0): 7
Distance from target shape to green rectangle at (6, 6): 2
Closest shape is the green rectangle at (6, 6) with distance 2</think>

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