There are 4 shapes on a 10x10 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 (7, 1)
Distance from target shape to purple trapezoid at (5, 7): 8
Distance from target shape to cyan square at (7, 7): 6
Distance from target shape to green right_triangle at (7, 8): 7
Closest shape is the cyan square at (7, 7) with distance 6</think>

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