There are 4 shapes on a 10x10 grid. Which shape is closest to the blue 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: blue rectangle at (3, 3)
Distance from target shape to purple square at (0, 2): 4
Distance from target shape to brown rectangle at (2, 0): 4
Distance from target shape to gray square at (5, 4): 3
Closest shape is the gray square at (5, 4) with distance 3</think>

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