There are 5 shapes on a 6x6 grid. Which shape is closest to the blue 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: blue square at (5, 3)
Distance from target shape to red rectangle at (0, 3): 5
Distance from target shape to orange trapezoid at (4, 5): 3
Distance from target shape to green trapezoid at (1, 4): 5
Distance from target shape to gray rectangle at (4, 2): 2
Closest shape is the gray rectangle at (4, 2) with distance 2</think>

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