There are 2 shapes on a 7x7 grid. Which shape is closest to the blue right_triangle 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 right_triangle at (4, 0)
Distance from target shape to red square at (6, 2): 4
Closest shape is the red square at (6, 2) with distance 4</think>

<answer>(6, 2)</answer>