There are 5 shapes on a 7x7 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 (3, 6)
Distance from target shape to brown trapezoid at (6, 1): 8
Distance from target shape to green right_triangle at (1, 2): 6
Distance from target shape to orange rectangle at (6, 5): 4
Distance from target shape to red rectangle at (4, 4): 3
Closest shape is the red rectangle at (4, 4) with distance 3</think>

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