题解 | #查找兄弟单词#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
rl.on('line', function (line) {
    const tokens = line.split(' ');
    const n = Number(tokens[0])
    const arr = tokens.slice(1, n+1)
    const word = tokens.at(-2)
    const k = Number(tokens.at(-1))

    const res = []

    for(let str of arr){
        if(str !== word && str.split('').sort().join('') === word.split('').sort().join('')){
            res.push(str)
        }
    }

    console.log(res.sort().length)
    console.log(res[k-1] ?? '')
})