There are 4 shapes on a 8x8 grid. Which shape is closest to the red 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: red square at (5, 6)
Distance from target shape to pink square at (1, 2): 8
Distance from target shape to blue trapezoid at (6, 6): 1
Distance from target shape to gray square at (1, 4): 6
Closest shape is the blue trapezoid at (6, 6) with distance 1</think>

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