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

<answer>(5, 3)</answer>