emailExtract

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.lang.String;

public class emailValidator {

    public static void main(String[] args) {
        String regex = "^[A-Za-z0-9+_.-]+@(.+)$";
        Scanner input = new Scanner(System.in);
        String [] emails = input.nextLine().split("[, ;]+");
        Pattern pattern = Pattern.compile(regex);
        for (String email : emails) {
            Matcher matcher = pattern.matcher(email);
            if (matcher.matches()==true){
                System.out.println(email);
            }
        }
    }
}