// Write a program to demonstrate the knowledge of students in Java Exception handling.

import java.util.*;
import java.util.regex.*;

public class q7 {
    public static void main(String[] args) {
        Scanner src = new Scanner(System.in);
        String registration = src.nextLine();
        String mobile = src.nextLine();
        // Matcher m = Pattern.matche
        try {
            if (registration.length() != 9 || mobile.length() != 10) {
                throw new IllegalArgumentException("");
            }
            if (!Pattern.matches("\\d{10}", mobile)) {
                throw new NumberFormatException("");
            }
            if (!Pattern.matches("[\\w]{9}", registration)) {
                throw new NoSuchElementException("");
            }
            System.out.println("valid");
        } catch (Exception e) {
            System.out.println(e);
            System.out.println("invalid");
        }
    }
}