package com.Exam;

import java.text.ParseException;

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

public class BeerTime {
    public static void main(String[] args) throws ParseException {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        try {
            SimpleDateFormat format = new SimpleDateFormat("hh:mm a");
            Date d1;
            d1 = format.parse(input);
            String start = "1:00 PM ";
            String end = "3:00 AM ";

            Date startTime = format.parse(start);
            Date endTime = format.parse(end);

            if (d1.after(endTime) && d1.before(startTime)) {
                System.out.println("non-beer time");
            } else {
                System.out.println("beer time");
            }

        } catch (Exception e) {
            System.out.println("invalid time");
        }
    }
}