import java.util.Scanner;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/* Problem statement:

* Validating a phone number BAA-AAA-AAAA using regular expression in Java..

* ..where A is a digit ranging 0-9 and B is also a digit ranging 1-9

*/

/*

* ^ - starting of the matching regex

* $ - ending of the matching regex

* \\w - Any alphanumeric character

* \\. - Dot character

* + - More than one character

* [1-9] - Any digit between 1 to 9

*/

public class JavaRegex2 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

String email = sc.next();

Pattern p = Pattern.compile("^[1-9]\\d{2}-\\d{3}-\\d{4}$");

Matcher matcher = p.matcher(email);

if(matcher.find()){

System.out.println("This is a valid phone number");

}

else

System.out.println("This is not a valid phone number");

}

}