There are 3 shapes on a 8x8 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 (2, 5)
Distance from target shape to brown square at (4, 7): 4
Distance from target shape to gray square at (5, 7): 5
Closest shape is the brown square at (4, 7) with distance 4</think>

<answer>(4, 7)</answer>