using System;

public class Program

{

    public static void Main()

    {

            int m = int.Parse(Console.ReadLine());

            int x, d, v, b;

            d = m % 100000;

            v=m%100;

            x = (m % 100000) / 1000;

            b=(((d*100000)+x*100)+v);

            if ((m < 0) && (m / 100000) != 0 && (v>99 || v<99))

            {

                Console.WriteLine("invalid number");

            }

            if (x < 1 && x > 12)

            {

                Console.WriteLine("invalid month");

            }

            if (((x == 1 || x == 3 || x == 5 || x == 7 || x == 8 || x == 10 || x == 12) &&  d < 1 || d > 31) )

            {

                Console.WriteLine("Invalid day");

            }

            if (x == 2 && m/4==0 && d>29 || d<0)

            {

                Console.WriteLine("Invalid day");

            }

            if ((x == 4 ||  x == 6 || x == 9 || x == 11) && d < 1 || d > 30)

            {

                Console.WriteLine("Invalid day");

            }

        else

            Console.Write(b);

    }

}