There are 4 shapes on a 6x6 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, 0)
Distance from target shape to red rectangle at (1, 3): 7
Distance from target shape to cyan rectangle at (4, 4): 5
Distance from target shape to gray square at (2, 5): 8
Closest shape is the cyan rectangle at (4, 4) with distance 5</think>

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