### Even-Odd Sudoku

**Even-Odd Sudoku**: fill in the grid so that every row, every column, and every **3 x 3** box contains the digits 1 through 9. Cells with gray circles must contain odd digits, cells with gray squares must contain even digits.

The formats of sudoku files:

**EOS** - Even-Odd Sudoku (9 x 9);
**EOS6** - Even-Odd Sudoku (6 x 6);
**EOS8** - Even-Odd Sudoku (8 x 8).