import java.text.DateFormat;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class Problem11BeerTime {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String input = scanner.nextLine();
        int lend = input.length();

        String hoursString = (input.substring(0, 2));
        int hours = Integer.parseInt(hoursString);
        String minutesString = input.substring(3, 5);
        int minutes = Integer.parseInt(minutesString);
        String designator = input.substring(6, 8);

        if (lend != 8
                || hours < 01 || hours > 12
                || minutes < 00 || minutes > 59
                || !designator.equals("AM") && !designator.equals("PM")) {
            System.out.println("invalid time");
        }

        if (hours >= 1 && (minutes >= 00 || minutes <= 59) && designator.equals("PM")
                || hours < 3 && designator.equals("AM")) {
            System.out.println("beer time");
        }else {
            System.out.println("non-beer time");
        }
    }
}