There are 3 shapes on a 9x9 grid. Which shape is closest to the yellow rectangle 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 rectangle at (5, 4)
Distance from target shape to blue square at (6, 4): 1
Distance from target shape to gray square at (4, 2): 3
Closest shape is the blue square at (6, 4) with distance 1</think>

<answer>(6, 4)</answer>