There are 3 shapes on a 7x7 grid. Which shape is closest to the yellow 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: yellow square at (5, 2)
Distance from target shape to green square at (4, 2): 1
Distance from target shape to gray square at (0, 6): 9
Closest shape is the green square at (4, 2) with distance 1</think>

<answer>(4, 2)</answer>