here is final answer:

  Iterator it=mylist.iterator();
  while(it.hasNext()){
     Object element = it.next();
     if(element instanceof String){
        if (String.valueOf(element).matches("[a-zA-Z]")) {
        System.out.println(element);
}
     }else{
        continue;
     }//Hints: use instanceof operator

        break;
    }
  return it;

}