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 chars = line.split('').reverse()
    const results = chars.reduce((prev, cur) => {
        if (!prev.map[cur]) {
            prev.string += cur
            prev.map[cur] = true
        }
        return prev
    }, {string: '', map: {}})
    console.log(results.string)
});