There are 4 shapes on a 7x7 grid. Which shape is closest to the orange 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: orange square at (4, 3)
Distance from target shape to green right_triangle at (1, 2): 4
Distance from target shape to red rectangle at (5, 6): 4
Distance from target shape to gray right_triangle at (6, 1): 4
Closest shape is the green right_triangle at (1, 2) with distance 4</think>

<answer>(1, 2)</answer>