There are 2 shapes on a 8x8 grid. Which shape is closest to the cyan square 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 square at (1, 3)
Distance from target shape to green rectangle at (5, 6): 7
Closest shape is the green rectangle at (5, 6) with distance 7</think>

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