There are 4 shapes on a 8x8 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 (6, 7)
Distance from target shape to cyan rectangle at (5, 4): 4
Distance from target shape to gray square at (0, 6): 7
Distance from target shape to orange rectangle at (3, 3): 7
Closest shape is the cyan rectangle at (5, 4) with distance 4</think>

<answer>(5, 4)</answer>