There are 3 shapes on a 10x10 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 (5, 6)
Distance from target shape to red square at (6, 8): 3
Distance from target shape to green square at (7, 8): 4
Closest shape is the red square at (6, 8) with distance 3</think>

<answer>(6, 8)</answer>