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 nums = line.split('').reverse();
    const uniqueNums = nums.filter((value, index) => nums.indexOf(value) === index);
    console.log(uniqueNums.join(''));
});