There are 5 shapes on a 8x8 grid. Which shape is closest to the orange 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: orange square at (5, 5)
Distance from target shape to gray right_triangle at (0, 1): 9
Distance from target shape to blue right_triangle at (3, 2): 5
Distance from target shape to yellow right_triangle at (3, 5): 2
Distance from target shape to red rectangle at (5, 3): 2
Closest shape is the yellow right_triangle at (3, 5) with distance 2</think>

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