Beer time

import java.util.Scanner;

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

        String time = scanner.nextLine();

        int a = time.length();

        String substringTime = time.substring(a - 2);
        String substring2 = time.substring(0, 2);
        String substring3 = time.substring(0, 1);
        String minutes1 = time.substring(a - 5, a - 3);
        int hours8 = 0;
        int hours7 = 0;
        int minutes = 0;

        if (substringTime.equals("AM")) {
            minutes = Integer.parseInt(minutes1);
            if (minutes > 59) {
                System.out.println("invalid time");
            } else if (a == 8) {
                    hours8 = Integer.parseInt(substring2);
                    if (hours8 >= 1 && hours8 < 3 || hours8 == 12) {
                        System.out.println("beer time");
                    } else if (hours8 >= 3 && hours8 < 6 || hours8 >= 10 && hours8 <= 11) {
                        System.out.println("non-beer time");
                    } else {
                        System.out.println("invalid time");
                    }
                } else if (a == 7) {
                    hours7 = Integer.parseInt(substring3);
                    if (hours7 >= 6 && hours7 <= 9) {
                        System.out.println("non-beer time");
                    } else {
                        System.out.println("invalid time");
                    }
                }

            } else if (substringTime.equals("PM")) {
            minutes = Integer.parseInt(minutes1);
             if (minutes > 59) {
                System.out.println("invalid time");
            }
            else if (a == 8) {
                    hours8 = Integer.parseInt(substring2);
                    if (hours8 >= 10 && hours8 <= 11) {
                        System.out.println("beer time");
                    } else if (hours8 == 12) {
                        System.out.println("non-beer time");
                    } else {
                        System.out.println("invalid time");
                    }
                } else if (a == 7) {
                    hours7 = Integer.parseInt(substring3);
                    if (hours7 >= 1 && hours7 <= 9) {
                        System.out.println("beer time");
                    } else {
                        System.out.println("invalid time");
                    }
                } else {
                    System.out.println("invalid time");
                }
            }
        }
    }