There are 2 shapes on a 6x6 grid. Which shape is closest to the purple 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: purple right_triangle at (1, 1)
Distance from target shape to red square at (3, 0): 3
Closest shape is the red square at (3, 0) with distance 3</think>

<answer>(3, 0)</answer>