题解 | #查找兄弟单词#

let arr = readline().split(' ');
let brr = [];
let n = +arr.shift();
let k = +arr.pop();
let kk = '';
let x = arr.pop();
let xx = x.split('').sort().join('');
for(let i = 0; i < arr.length; i++) {
    let s = arr[i];
    let ss = s.split('').sort().join('');
    if(s != x && ss == xx) {
        brr.push(s);
    }
}
brr.sort();
kk = brr[k-1] ? brr[k-1] : '';
console.log(brr.length);
console.log(kk);