题解 | #提取不重复的整数#

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())) {
        let input_arr = line.split("");
        let new_arr = [];
        let ans = "";
        for (let i = input_arr.length - 1; i >= 0; i--) {
            if (!new_arr.includes(input_arr[i])) {
                new_arr.push(input_arr[i]);
                ans += input_arr[i];
            }
        }

        console.log(ans);
    }
})();