There are 2 shapes on a 6x6 grid. Which shape is closest to the gray 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: gray right_triangle at (3, 3)
Distance from target shape to red square at (0, 1): 5
Closest shape is the red square at (0, 1) with distance 5</think>

<answer>(0, 1)</answer>