import java.util.Scanner;

public class DayOfProgrammer {
    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 < 0) {
            System.out.println("-1");
            return;
        }

        String date;
        if (year == 1918) {
            // Transition year (Julian → Gregorian in Russia)
            date = "26.09.1918";
        } else if (year <= 1917) {
            // Julian calendar leap year
            if (year % 4 == 0) {
                date = "12.09." + year;
            } else {
                date = "13.09." + year;
            }
        } else {
            // Gregorian calendar leap year
            if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) {
                date = "12.09." + year;
            } else {
                date = "13.09." + year;
            }
        }

        System.out.println(date);
    }
}