题解 | #提取不重复的整数#

const readline = require("readline");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
rl.on("line", function (line) {
    const tokens = line.split(" ");
    // TODO: code start
    new Set(tokens[0].split("").reverse()).forEach((item: string) => {
        process.stdout.write(item);
    });
});