import java.io.*; import java.util.*; class Main { public static void main(String args[])throws Exception { BufferedReader bu=new BufferedReader(new InputStreamReader(System.in)); StringBuilder sb=new StringBuilder(); int n=Integer.parseInt(bu.readLine()); int a,i; boolean v[]=new boolean[36]; String s[]=bu.readLine().split(" "); for(i=0;i