using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Program
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] list = Console.ReadLine().Split();
            string output = null;

            //?=1の場合
            for (int i = 0; i < 3; ++i)
            {
                if (String.Compare(list[i],"?",true) == 0)
                {
                    list[i] = "1";
                }
            }

            int x1 = int.Parse(list[0]);
            int x2 = int.Parse(list[1]);
            int x3 = int.Parse(list[2]);

            if ((x2 > x1 && x2 > x3) || (x2 < x1 && x2 < x3))
            {
                output =  "1";
            }


            //?=4の場合
            for (int i = 0; i < 3; ++i)
            {
                if (String.Compare(list[i], "?", true) == 0)
                {
                    list[i] = "4";
                }
            }

            int x4 = int.Parse(list[0]);
            int x5 = int.Parse(list[1]);
            int x6 = int.Parse(list[2]);

            if ((x5 > x4 && x5 > x6) || (x5 < x4 && x5 < x6))
            {
                output = "4";
            }


            Console.WriteLine(output);
            Console.WriteLine();
        }
    }
}