/**
 * This program validates.
 *
 * @shuggins (your name)
 */

import java.util.Scanner;
public class SSN
{
    public static void main(String [] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.println("Please input your SSN and I will let you know if it is valid.");
        String sSN=in.nextLine();
        String h1=sSN.substring(3,4);
        String h2=sSN.substring(6,7);
        if(sSN.length()==11)
        {
            if(h1.indexOf("-")==0)
            {
                System.out.println("Valid");
            }
            else
            {
                System.out.println("Not Valid");
            }
        }
        else
        {
            System.out.println("Not Valid"); 
        }
   
    }
}