There are 3 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 (8, 1)
Distance from target shape to orange trapezoid at (3, 4): 8
Distance from target shape to green rectangle at (1, 2): 8
Closest shape is the orange trapezoid at (3, 4) with distance 8</think>

<answer>(3, 4)</answer>