def main():
grid = Grid.from_string("""
- ...69....
- 9.5..876.
- ..4..1.2.
- 6...5...3
- 38.....49
- 7...3...2
- .7.9..3..
- .231..4.8
- ....83...
- """)
-
- print grid
-
- grid.solve()
-
- print grid
-
-
-
- grid = Grid.from_string("""
3...2...7
...3.1...
..6...4..