There are 2 shapes on a 9x9 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, 3)
Distance from target shape to yellow right_triangle at (5, 3): 1
Closest shape is the yellow right_triangle at (5, 3) with distance 1</think>

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