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


public class SetExample {
	
	public static void main(String[] args) {

		Scanner input = null;
		try {
			input = new Scanner(new File(args[0]));
		}
		catch (FileNotFoundException e) {
			System.out.println("Could not read input file: " + args[0]);
			return;
		}
		
		input.useDelimiter("(\\s|,|\\.)+");

		Set words = new HashSet();

		while (input.hasNext()) {
			String w = input.next();
			words.add(w);
		}

		input.close();
		
		System.out.println(words.toString());
	}
}