import java.io.File;
import java.io.FileNotFoundException;
import java.util.HashSet;
import java.util.Scanner;

public class Runner
{
    private static HashSet<String> names = new HashSet<String>();

    public static void main(String [] args)
    {
        Scanner tax = null;
        Scanner unem = null;

        try
        {
            tax = new Scanner(new File("taxpayers.txt"));
            unem = new Scanner( new File("unemployed.txt"));
        }
        catch(FileNotFoundException e)
        {
            System.out.println("Files not found!");
            System.out.println(e.toString());
            System.exit(1);
        }

        while(tax.hasNextLine())
        {
            String taxed = tax.nextLine();
            names.add(taxed);
        }

        while(unem.hasNextLine())
        {
            String unemployed = unem.nextLine();
            if(!names.add(unemployed))
            {
                System.out.println("Name : " + unemployed + " occured in both taxpayers and unemployed.");
            }
        }
    }
}