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
    let line = await readline();
    let charArr = line.toString().split('').reverse();
    let lastStr = '';
    charArr.forEach(char =>{
        if(lastStr.indexOf(char) == -1){
            lastStr+=char;
        }
    });
    console.log(Number(lastStr));
}()