该算法既适合于字母文字信息的加密，也适合非字母文字信息的加密。
This system is suitable for encryption of both messages based on letter and non-letter.
在很多非英语文字中，字母上边或下边注有符号，表示其读音，这些表音符号就是音标。
Marks which are placed above or below English characters to indicate their pronunciation, especially in many non-English languages.
给定一个非空字符串，包含一组乱序的英文字母表示的数字0-9，按递增序输出这些数字。
Given a non-empty string containing an out-of-order English representation of digits 0-9, output the digits in ascending order.
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