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

<answer>(5, 6)</answer>