题解 | #查找兄弟单词#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class Main {
    static List<String> list = new ArrayList<>();

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String[] arr = s.split(" ");
        int k = Integer.parseInt(arr[arr.length - 1]);
        String target = arr[arr.length - 2];
        char[] chars = target.toCharArray();
        Arrays.sort(chars);
        String sort = Arrays.toString(chars);
        for (int i = 1; i < arr.length - 2; i++) {
            if (!target.equals(arr[i]))
                check(arr[i], sort);
        }
        System.out.println(list.size());
        Collections.sort(list);
        if (k <= list.size()) {
            System.out.println(list.get(k - 1));
        }

    }

    public static void check(String a, String b) {
        char[] chars = a.toCharArray();
        Arrays.sort(chars);
        if (Arrays.toString(chars).equals(b)) {
            list.add(a);
        }
    }
}