There are 5 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 (9, 2)
Distance from target shape to blue right_triangle at (6, 7): 8
Distance from target shape to brown right_triangle at (1, 4): 10
Distance from target shape to cyan right_triangle at (7, 6): 6
Distance from target shape to yellow square at (8, 3): 2
Closest shape is the yellow square at (8, 3) with distance 2</think>

<answer>(8, 3)</answer>