对字符串进行加密，规则是每个字母后移5位，例如A变为F，b变为g，x变为c，y变为d-To encrypt a string, the rule is that each letter backward 5, for example, A to F, b becomes g, x becomes c, d y becomes

对字符串进行加密，规则是每个字母后移5位，例如A变为F，b变为g，x变为c，y变为d…-Encrypt string, the rule is backward 5 each letter, for example, A to F, b becomes g, x becomes c, y goes d ...