There are 4 shapes on a 8x8 grid. Which shape is closest to the cyan 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: cyan trapezoid at (6, 4)
Distance from target shape to purple square at (7, 3): 2
Distance from target shape to yellow square at (2, 1): 7
Distance from target shape to blue trapezoid at (6, 1): 3
Closest shape is the purple square at (7, 3) with distance 2</think>

<answer>(7, 3)</answer>