import java.util.Scanner;

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

        if (!sc.hasNextInt()) {
            System.out.println("Invalid input");
            return;
        }

        int year = sc.nextInt();

        // If year is negative → print -1
        if (year < 0) {
            System.out.println("-1");
            return;
        }

        String date = "";

        if (year == 1918) {
            // Transition year in Russia: 14 days lost (Feb 14 was the 32nd day)
            date = "26.09.1918";
        } else if ((year < 1918 && year % 4 == 0) || 
                   (year > 1918 && ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)))) {
            // Leap years (Julian before 1918, Gregorian after 1918)
            date = "12.09." + year;
        } else {
            // Normal year
            date = "13.09." + year;
        }

        System.out.println(date);
    }
}