There are 2 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 (1, 3)
Distance from target shape to pink square at (1, 4): 1
Closest shape is the pink square at (1, 4) with distance 1</think>

<answer>(1, 4)</answer>