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

<answer>(2, 4)</answer>