There are 6 shapes on a 8x8 grid. Which shape is closest to the yellow 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: yellow right_triangle at (2, 6)
Distance from target shape to brown trapezoid at (3, 0): 7
Distance from target shape to gray trapezoid at (1, 5): 2
Distance from target shape to purple right_triangle at (4, 4): 4
Distance from target shape to red rectangle at (5, 5): 4
Distance from target shape to orange rectangle at (5, 1): 8
Closest shape is the gray trapezoid at (1, 5) with distance 2</think>

<answer>(1, 5)</answer>