There are 3 shapes on a 7x7 grid. Which shape is closest to the blue 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: blue rectangle at (6, 4)
Distance from target shape to purple rectangle at (0, 0): 10
Distance from target shape to orange right_triangle at (2, 5): 5
Closest shape is the orange right_triangle at (2, 5) with distance 5</think>

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