There are 3 shapes on a 6x6 grid. Which shape is closest to the yellow 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: yellow right_triangle at (5, 2)
Distance from target shape to cyan right_triangle at (3, 4): 4
Distance from target shape to red rectangle at (1, 2): 4
Closest shape is the cyan right_triangle at (3, 4) with distance 4</think>

<answer>(3, 4)</answer>