There are 4 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, 2)
Distance from target shape to cyan trapezoid at (2, 4): 3
Distance from target shape to blue square at (4, 4): 5
Distance from target shape to pink square at (2, 3): 2
Closest shape is the pink square at (2, 3) with distance 2</think>

<answer>(2, 3)</answer>