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 arr = String(line).split(""); // 先把字符串转成数组
        arr.reverse(); // 再逆序排列
        arr = Array.from(new Set(arr)); // 利用去重特性，前面出现过的元素，去掉后面相同的元素
        console.log(arr.join(""))；// 转成字符串输出结果
    }
}()