There are 3 shapes on a 8x8 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 (0, 1)
Distance from target shape to green trapezoid at (6, 0): 7
Distance from target shape to red right_triangle at (1, 5): 5
Closest shape is the red right_triangle at (1, 5) with distance 5</think>

<answer>(1, 5)</answer>