import java.util.Scanner;

public class P11_beerTime {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String time = scanner.nextLine();
        String hours = "";
        String minutes = "";
        String period = "";

        if (time.length() == 8) {
            hours = time.substring(0, 2);
            minutes = time.substring(3, 5);
            period = time.substring(6, 8);
        } else {
            hours = time.substring(0, 1);
            minutes = time.substring(2, 4);
            period = time.substring(5, 7);
        }

        if (period.equals("PM")) {
            switch (hours) {
                case "1":
                case "2":
                case "3":
                case "4":
                case "5":
                case "6":
                case "7":
                case "8":
                case "9":
                case "10":
                case "11":
                case "12":
                    System.out.println("beer time");
                    break;
                default:
                    System.out.println("non-beer time");
                    break;
            }
        } else if (period.equals("AM")) {
            switch (hours) {
                case "01":
                case "02":
                    System.out.println("beer time");
                    break;
                default:
                    System.out.println("non-beer time");
                    break;
            }
        } else {
            System.out.println("Invalid time");
        }
    }
}