There are 6 shapes on a 9x9 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 (7, 6)
Distance from target shape to red trapezoid at (4, 6): 3
Distance from target shape to green trapezoid at (6, 4): 3
Distance from target shape to brown square at (2, 5): 6
Distance from target shape to yellow square at (4, 4): 5
Distance from target shape to gray trapezoid at (6, 3): 4
Closest shape is the red trapezoid at (4, 6) with distance 3</think>

<answer>(4, 6)</answer>