There are 4 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 (1, 3)
Distance from target shape to green right_triangle at (3, 4): 3
Distance from target shape to gray right_triangle at (2, 2): 2
Distance from target shape to purple rectangle at (5, 3): 4
Closest shape is the gray right_triangle at (2, 2) with distance 2</think>

<answer>(2, 2)</answer>