import java.util.*; public class Main{ public static void main(String[] arg){ Scanner sc=new Scanner(System.in); while(sc.hasNextLine()){ String[] strs =sc.nextLine().split(" "); Integer N = Integer.parseInt(strs[0]); String voi = strs[N+1]; Integer k = Integer.parseInt(strs[N+2]); List<String> list = new ArrayList<>(); for(int i=0; i<N; i++){ //找出兄弟单词并放入list中 boolean flag=false; String str = strs[i+1]; //排完序后一样就是兄弟单词 char[] c1 = str.toCharArray(); char[] c2 = voi.toCharArray(); if(c1.length!=c2.length){ continue; } Arrays.sort(c1); Arrays.sort(c2); for(int j = 0; j< c1.length;j++){ if(c1[j]!=c2[j]){ flag=true; } } if(!flag&&voi.length()==str.length()&&(!(voi.equals(str)))){ list.add(str); } } //对list排序以找到第k个 Collections.sort(list,(a,b)->a.compareTo(b)); System.out.println(list.size()); for(int i=0;i<list.size();i++){ // System.out.print(list.get(k-1)+" "); } if(list.size()>=k){ System.out.println(list.get(k-1)); } } } }