const rl = require("readline").createInterface({ 
    input: process.stdin,
    output: process.stdout    
});

const inputs = [];

rl.on('line', (line) => {
    inputs.push(line);
}).on('close', () => {
    const encodeStr = encode(inputs[0]);
    console.log(encodeStr);

    const decodePwd = decode(inputs[1]);
    console.log(decodePwd);
})

function encode(str) {
  let res = "";
  for (let i = 0; i < str.length; i++) {
    const temp = str[i];

    if (/\d/.test(temp)) {
      let n = temp == "9" ? 0 : parseInt(temp) + 1;
      res += n;
    } else if (/[A-Z]/.test(temp)) {
      let C = temp == "Z" ? "a" : String.fromCharCode(temp.charCodeAt() + 1);
      res += C.toLowerCase();
    } else if (/[a-z]/.test(temp)) {
      let c = temp == "z" ? "A" : String.fromCharCode(temp.charCodeAt() + 1);
      res += c.toUpperCase();
    } else {
      res += temp;
    }
  }
  return res;
}

function decode(pwd) {
  let res = '';
  for(let i = 0; i < pwd.length; i++) {
    const temp = pwd[i];
    
    if(/\d/.test(temp)) {
      let n = temp == '0' ? 9 : parseInt(temp) - 1;
      res += n;
    } else if(/[A-Z]/.test(temp)) {
      let c = temp == 'A' ? 'z' : String.fromCharCode((temp.charCodeAt() - 1));
      res += c.toLowerCase();
    } else if(/[a-z]/.test(temp)) {
      let c = temp == 'a' ? 'Z' : String.fromCodePoint((temp.charCodeAt() - 1));
      res += c.toUpperCase();
    } else {
      res += temp;
    }
  }
  return res;
}

步骤：

1、 加密encode：

• 数字：9 -> 0， 0-8 -> i + 1
• A-Z：Z -> A -> a，A - Y -> String.fromCharCode(i.charCodeAt() + 1) -> toLowerCase()
• a-z: z -> a -> A, a - y -> String.fromCharCode(i.charCodeAt + 1) -> toUpperCase();
• 其它字符: 不变

2、解密decode:

上述过程的逆过程