There are 3 shapes on a 7x7 grid. Which shape is closest to the green square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green square at (4, 1)
Distance from target shape to purple rectangle at (5, 5): 5
Distance from target shape to yellow right_triangle at (2, 3): 4
Closest shape is the yellow right_triangle at (2, 3) with distance 4</think>

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