There are 5 shapes on a 8x8 grid. Which shape is closest to the orange rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: orange rectangle at (6, 3)
Distance from target shape to pink rectangle at (1, 6): 8
Distance from target shape to cyan trapezoid at (0, 7): 10
Distance from target shape to blue right_triangle at (0, 2): 7
Distance from target shape to yellow right_triangle at (3, 5): 5
Closest shape is the yellow right_triangle at (3, 5) with distance 5</think>

<answer>(3, 5)</answer>