There are 2 shapes on a 6x6 grid. Which shape is closest to the cyan 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: cyan right_triangle at (3, 1)
Distance from target shape to orange rectangle at (1, 3): 4
Closest shape is the orange rectangle at (1, 3) with distance 4</think>

<answer>(1, 3)</answer>