import java.util.*;


public class Sandbox {


    public static void main(String args[]) {
        try {
            Scanner sc = new Scanner(System.in);
            System.out.println("Please enter a date (YYYY-MM-DD): ");

            String str = sc.nextLine();

            if(str.length() == 10){
                boolean hasDash = str.charAt(4) == '-' && str.charAt(7) == '-';
                int count = 0;
                for(int i = 0; i < 10; ++i){
                    if (Character.isDigit(str.charAt(i))){
                        ++count;
                    }
                }
                boolean hasDigits = (count == 8);

                if (hasDash && hasDigits){

                    int year = Integer.parseInt(str.substring(0, 4));
                    int month = Integer.parseInt(str.substring(5, 7));
                    int day = Integer.parseInt(str.substring(8, 10));

                    int [] monthSizes = {
                        31, 28, 31, 30, 31, 30,
                        31, 31, 30, 31, 30, 31,
                    };

                    boolean isProperDay = false;
                    boolean isProperMonth = true;

                    if(month < 1 || month > 12){
                        isProperMonth = false;
                        System.out.println("Invalid month");
                    } else {
                        if (month != 2){
                            isProperDay = (day > 0) && (day <= monthSizes[month-1]);
                        } else {
                            boolean isLeap = true;
                            if (year % 4 != 0){
                                isLeap = false;
                            } else if (year % 100 != 0){
                                isLeap = true;
                            } else if (year % 400 != 0){
                                isLeap = false;
                            } else {
                                isLeap = true;
                            }
                            isProperDay = (day > 0) && (day <= (isLeap ? 29 : 28));
                        }
                        if (isProperDay){
                            System.out.println("The date is perfect!");
                        } else {
                            System.out.println("Invalid day");
                        }
                    }
                } else {
                    System.out.println("Error, invalid date format");
                }

            } else {
                System.out.println("Error, wrong length");
            }


            sc.close();

        } catch(Exception e){
            System.out.println(e);
            System.out.println("Unexpected error, sorry!");
        }


    }

}