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

<answer>(5, 0)</answer>