Beer Time

import java.util.Scanner;

public class Problem11_BeerTime {
    public static void main(String[] args) {
        Scanner myScan = new Scanner(System.in);
        String time = myScan.nextLine();

        String result = "";
        int index = time.indexOf(":");
        int indexSp = time.indexOf(" ");

        if (index < 0 || indexSp < index) {
            result = "invalid time";
        } else {
            String hourAsString = time.substring(0, index);
            String minutesAsString = time.substring(index + 1, indexSp);
            String am_pm = time.substring(indexSp + 1);
            if (hourAsString.length() > 2 || minutesAsString.length() != 2 || !(am_pm.equals("PM") || am_pm.equals("AM"))) {
                result = "invalid time";
            } else {
                try {
                    int hour = Integer.parseInt(hourAsString);
                    int minutes = Integer.parseInt(minutesAsString);
                    if (hour < 1 || hour > 12 || minutes < 0 || minutes > 59) {
                        result = "invalid time";
                    } else if (hour > 0 && hour < 12 && am_pm.equals("PM") || (hour == 12 || hour > 0 && hour < 3) && am_pm.equals("AM")) {
                        result = "beer time";
                    } else {
                        result = "non-beer time";
                    }
                } catch (Exception exception) {
                    result = "invalid time";
                }
            }
        }
        System.out.println(result);
    }
}