There are 3 shapes on a 8x8 grid. Which shape is closest to the orange right_triangle 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 right_triangle at (4, 6)
Distance from target shape to cyan right_triangle at (2, 5): 3
Distance from target shape to yellow trapezoid at (5, 5): 2
Closest shape is the yellow trapezoid at (5, 5) with distance 2</think>

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