题解 | #字符串加解密#

let input;
let lineNum = 1;
while (input = readline()) {
    if (lineNum === 1) {
        let arr = input.split('');
        let pwd = [];
        for (let i = 0; i < arr.length; i++) {
            const item = arr[i].charCodeAt(0);
            let pwdItem = '';
            if (item >= 65 && item < 90) {
                pwdItem = String.fromCharCode((item + 33));
            } else if (item === 90) {
                pwdItem = 'a';
            } else if (item >= 97 && item < 122) {
                pwdItem = String.fromCharCode((item - 31));
            } else if (item === 122) {
                pwdItem = 'A';
            } else if (Number(arr[i]) >= 0 && Number(arr[i]) < 9) {
                pwdItem = Number(arr[i]) + 1 + '';
            } else if (Number(arr[i]) === 9) {
                pwdItem = '0';
            }
            
            pwd.push(pwdItem);
        }
        print(pwd.join(''));
    }
    
    if (lineNum === 2) {
        let arr = input.split('');
        let pwd = [];
        for (let i = 0; i < arr.length; i++) {
            const item = arr[i].charCodeAt(0);
            let pwdItem = '';
            if (item > 65 && item <= 90) {
                pwdItem = String.fromCharCode((item + 31));
            } else if (item === 65) {
                pwdItem = 'z';
            } else if (item > 97 && item <= 122) {
                pwdItem = String.fromCharCode((item - 33));
            } else if (item === 97) {
                pwdItem = 'Z';
            } else if (Number(arr[i]) > 0 && Number(arr[i]) <= 9) {
                pwdItem = Number(arr[i]) - 1 + '';
            } else if (Number(arr[i]) === 0) {
                pwdItem = '9';
            }
            
            pwd.push(pwdItem);
        }
        print(pwd.join(''));
        
        lineNum = 0;
    }
    
    lineNum++;
}