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

<answer>(4, 5)</answer>