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 public void SearchString(String s) {
      if (s==null||s=="") {
       System.out.println("NOT FIND");
      }
      for (int i=0;i<s.length();i++) {
       char a=s.charAt(i);
       String c=String.valueOf(a);
       String d=s.replaceFirst(c, "");
       if(d.contains(c)==false) {
        System.out.println(c);
        break;
       }
       System.out.println("not find");
       break;
      }
      

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