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说明：  将输入的字符串（字符串仅包含小写字母‘a’到‘z’），按照如下规则， 循环转换后输出：a->b,b->c,…,y->z,z->a；若输入的字符串连续出现两个字母相同时， 后一个字母需要连续转换2次。例如：aa 转换为 bc，zz 转换为 ab；当连续相同字母超过两个时， 第三个出现的字母按第一次出现算。
(The input string (string contains only lowercase letters ' a' to ' z' ), in accordance with the following rules, the cycle conversion output: a-> b, b-> c, ..., y-> z, z-> a If the input string two consecutive letters are the same, the letter needs to convert two consecutive times. For example: aa convert bc, zz converted to ab When more than two consecutive identical letters, the third letter that appears the first time by the operator.)