There are 3 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 (3, 0)
Distance from target shape to pink right_triangle at (7, 1): 5
Distance from target shape to orange trapezoid at (6, 7): 10
Closest shape is the pink right_triangle at (7, 1) with distance 5</think>

<answer>(7, 1)</answer>