There are 4 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray right_triangle at (1, 0)
Distance from target shape to yellow trapezoid at (6, 4): 9
Distance from target shape to purple right_triangle at (0, 7): 8
Distance from target shape to green rectangle at (5, 4): 8
Closest shape is the purple right_triangle at (0, 7) with distance 8</think>

<answer>(0, 7)</answer>