There are 5 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, 7)
Distance from target shape to pink square at (8, 1): 6
Distance from target shape to gray right_triangle at (6, 7): 2
Distance from target shape to orange trapezoid at (0, 6): 9
Distance from target shape to green rectangle at (1, 8): 8
Closest shape is the gray right_triangle at (6, 7) with distance 2</think>

<answer>(6, 7)</answer>