There are 6 shapes on a 10x10 grid. Which shape is closest to the gray rectangle 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 rectangle at (6, 3)
Distance from target shape to purple square at (7, 4): 2
Distance from target shape to blue right_triangle at (2, 3): 4
Distance from target shape to orange right_triangle at (6, 2): 1
Distance from target shape to red rectangle at (5, 7): 5
Distance from target shape to green right_triangle at (9, 5): 5
Closest shape is the orange right_triangle at (6, 2) with distance 1</think>

<answer>(6, 2)</answer>