题解 | #字符串加密# 添加大小写及空格判断

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    // Write your code here
    while ((line = await readline())) {
        var key = line.toLowerCase();
        var msg = await readline();
        var line = "abcdefghijklmnopqrstuvwxyz";
        var list = Array.from(new Set(key + line));
        const result = [];
        for (var i = 0; i < msg.length; i++) {
            if (msg[i] == " ") {
                result.push(" ");
                continue;
            } else {
                if (/[A-Z]/.test(msg[i])) {
                    result.push(list[line.indexOf(msg[i].toLowerCase())].toUpperCase());
                } else {
                    result.push(list[line.indexOf(msg[i])]);
                }
            }
        }
        console.log(result.join(""));
    }
})();