There are 5 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 (1, 5)
Distance from target shape to gray trapezoid at (2, 7): 3
Distance from target shape to orange rectangle at (4, 4): 4
Distance from target shape to cyan square at (0, 7): 3
Distance from target shape to red square at (5, 7): 6
Closest shape is the gray trapezoid at (2, 7) with distance 3</think>

<answer>(2, 7)</answer>