An IP address consists of four numbers from 0 to 255, inclusive, divided by the dots. For example, 127.0.0.1 is a valid IP address, but 256.0.0.1 and 127.0.1 are invalid IP addresses.

For a given string output "YES" if this string is a valid IP address, otherwise output "NO".

Sample Input 1:

127.0.0.1

Sample Output 1:

YES

Sample Input 2:

256.0.0.1

Sample Output 2:

NO

Sample Input 3:

127.0.1

Sample Output 3:

NO

Sample Input 4:

192.168.123.231

Sample Output 4:

YES

Sample Input 5:

-1.0.0.1

Sample Output 5:

NO

Sample Input 6:

127.0.0.1.

Sample Output 6:

NO

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String ip = scanner.nextLine();

        String regex = "(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
        boolean isIP = ip.matches("(" + regex + "\\.){3}" + regex);

        System.out.println(isIP ? "YES" : "NO");
    }
}