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

<answer>(5, 2)</answer>