There are 3 shapes on a 5x5 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 (4, 4)
Distance from target shape to blue square at (0, 0): 8
Distance from target shape to green rectangle at (3, 4): 1
Closest shape is the green rectangle at (3, 4) with distance 1</think>

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