(1)按照规则以下两条规则对输入的字符串进行解析： ①.α->β1β2...βn ②.(θδ1δ2...δn) -> θδnθn-1...δ2θδ1θ 其中的希腊字母标示可以用大写字母(变量)或者小写字母代换 大写字母表示α只可以使大写字母。 ①式表示变量的表达式；②式表示对括号中字符的解析。对输入一句符合上述规则的话解析的最终结果是不含有大写字母和括号-(1) In accordance with the rules of the following two rules of input strings Analysis : . - gt; 1 2 ... n . ( 1 2 ... n) - gt; n n-1 ... 2 1 the Greek alphabet marker capital letters can be used (variables) or lowercase letters substitution capital letters said can only make capital letters. said variable-expression; said right-brackets analytic characters. With the importation of a rule of the above analysis of the final results do not contain capital letters and brackets