翻译写一个程序来通过填充空格求解数独。空格用'。'表示。你可以假定这里只有唯一解。

Write a program to solve a Sudoku puzzle by filling the empty cells.

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即使你不擅长游戏，可以试试解数独、填字游戏(纵横字谜)，或者和朋友来局有难度的棋盘游戏，都能提高记忆力。

Even if you're not the game-playing type, trying your hand at Soduko, solving a crossword, or enjoying a challenging board game with friends encourages your brain's memory skills.

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