import java.util.*;

public class FindDups {
  public static void main(String args[]){
    Set s = new HashSet();
    for (int i=0; i<args.length; i++)
        if (!s.add(args[i]))
            System.out.println("Duplicate detected: " + 
                                args[i]);
    System.out.println(s.size() + 
                       " distinct words detected: " +
                       s);
  }
}