将一个长度不超过100的字符串加密和解密。密码规则如下：用原来的字母后面第4个字母代替原来的字母。例如，字母“A”后面第4个字母是“E”，用“E”代替“A”，用“c”代替“y”，以此类推……，非字母字符则不作任何转换

例如“China*12”加密后的结果为“Glmre*12”，“Glmre*12”解密后的结果为“China*12”。-A length of not more than 100 string encryption and decryption. Password rules are as follows: the first with the original letter back to replace the original four-letter alphabet. For example, the letter " A"　after the first four letters " E" , with the " E"　instead of " A" , with a " c"　instead of " y" , and so on ......, non-alphanumeric characters such as no conversion " China* 12 " The result is encrypted"　Glmre* 12 " ,"　Glmre* 12 " decrypted result is"　China* 12 " .