import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        String hour = scanner.next();
        String time = scanner.next();

        if ((time.equals("PM") && hour.charAt(0) >= '1')) {
            if (hour.charAt(0) == '1' && hour.charAt(1) == '2') {
                System.out.println("non-beer time");
            } else System.out.println("beer time");
        } else if (time.equals("AM") && hour.charAt(0) == '0' && hour.charAt(1) < '3' || hour.charAt(0) < '3' && hour.charAt(1) == ':') {
            System.out.println("beer time");
        } else System.out.println("non-beer time");
    }
}