using System;

public class Program

{

    public static void Main()

    {

        int x,num=0,y,m,d,y1,m1,d1,x1;

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

        y1=x%10000;

            m1=x%1000000/10000;

            d1=x/1000000;

        x1=x;

        while(num<19)

        {

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

            num++;

            y=x%10000;

            m=x%1000000/10000;

            d=x/1000000;

            if(y<y1)

            {

                x1=x;

            y1=y;

            m1=m;

            d1=d;

            }

                if(m<m1&&y<y1)

                {

                    x1=x;

            y1=y;

            m1=m;

            d1=d;

                }

                if(d<d1&&m<m1&&y<y1)

                {x1=x;

            y1=y;

            m1=m;

            d1=d;

                }

        }

        Console.WriteLine("{0}",x1);

    }

}