There are 6 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 (8, 2)
Distance from target shape to red right_triangle at (6, 1): 3
Distance from target shape to yellow right_triangle at (3, 9): 12
Distance from target shape to blue right_triangle at (7, 1): 2
Distance from target shape to green square at (0, 7): 13
Distance from target shape to orange rectangle at (9, 8): 7
Closest shape is the blue right_triangle at (7, 1) with distance 2</think>

<answer>(7, 1)</answer>