import java.util.*;
public class Main{
public static boolean checkBorther(String str1, String str2){
int[] arr = new int[26];
char[] ch1 = str1.toCharArray();
char[] ch2 = str2.toCharArray();
for(int i=0; i<ch1.length; i++){
arr[ch1[i]-'a']++;
arr[ch2[i]-'a']--;
}
for(int i=0; i<26; i++){
if(arr[i]!=0)
return false;
}
return true;
}
public static void main(String[] args){ Scanner sc = new Scanner(System.in); while(sc.hasNext()){ int N = sc.nextInt(); //输入字典中单词的个数 String[] str = new String[N]; for(int i=0; i<N; i++){ //输入n个单词作为字典单词 str[i]=sc.next(); } // 查找兄弟单词 String findStr = sc.next();//输入一个待查单词 int ind = sc.nextInt(); //输入待查单词的 指定序号 ArrayList<String> list = new ArrayList<>(); for(int i=0; i<N; i++){ if((str[i].length() == findStr.length()) && (!str[i].equals(findStr))){//长度相等 且 字符串不相等 if(checkBorther(findStr,str[i])){ list.add(str[i]); } } } //输出 System.out.println(list.size()); Collections.sort(list); if(list.size()>=ind){ System.out.println(list.get(ind-1)); } } }
}