There are 2 shapes on a 7x7 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 (2, 1)
Distance from target shape to yellow right_triangle at (3, 3): 3
Closest shape is the yellow right_triangle at (3, 3) with distance 3</think>

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