This is a Sudoku solver app. To use it, provide an unsolved Sudoku puzzle with unknown numbers represented as any character other than numbers, such as 'x' or '.', and let the solver solve it for you.
Put your sudoku in input.txt
Here is an example input:
x16xxxxx2
xxxxxx6xx
x5xx3x1xx
xxxxx342x
xxxxx2x7x
xxx651xxx
3xx5xxxxx
xx2x9xxxx
4xxxxxx89