There are 4 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 (2, 4)
Distance from target shape to orange square at (3, 1): 4
Distance from target shape to pink square at (1, 6): 3
Distance from target shape to gray right_triangle at (4, 6): 4
Closest shape is the pink square at (1, 6) with distance 3</think>

<answer>(1, 6)</answer>