题解 | #查找兄弟单词#

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 arr = []
    while(line = await readline()){
       arr = line.split(' ')
    }
    const index = arr.pop()
    const key = arr.pop()
    const key2 = key.split('').sort().join('')
    const source = arr.slice(1)
    const result = source.filter(v => {
      return (v !== key) && v.split('').sort().join('') === key2
    }).sort()
    console.log(result.length)
    if (result[index - 1]) console.log(result[index - 1])
}()