There are 3 shapes on a 7x7 grid. Which shape is closest to the blue square 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 square at (5, 1)
Distance from target shape to orange square at (2, 6): 8
Distance from target shape to gray right_triangle at (2, 5): 7
Closest shape is the gray right_triangle at (2, 5) with distance 7</think>

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