题解 | #整型数组合并#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

const lines = []

rl.on('line', function (line) {
    lines.push(line.split(' ').map((item) => parseInt(item)));
});

rl.on('close', () => {
    const newLines = lines[1].concat(lines[3]);
    const filterNewLines = newLines.filter((item, index, self) => self.indexOf(item) === index);
    console.log(filterNewLines.sort((a, b) => a - b).join(''));
})