hdu 1287

import java.util.*;import java.math.*;public class Main {   public static void main(String[]args)   {   Scanner in =  new Scanner(System.in);      while(in.hasNext())   {   int n = in.nextInt();   int array[] = new int[n];   for(int i=0;i<n;i++)   array[i]=in.nextInt();      for(int i=0+'A';i<=0+'Z';i++)   {   boolean flag = false;      for(int j=0;j<n;j++)      {      int temp = array[j]^i;      if(temp<0+'A'||temp>0+'Z')      {      flag = true; break;      }      }      if(!flag)      {      String s="";      for(int j=0;j<n;j++)      {      int temp = array[j]^i;      s = s+(char)(temp);      }      System.out.println(s);            }   }   }   }}