using System;

class Program
{
    static void Main()
    {
        var s = Console.ReadLine().Split();
        string[] cand = { "1", "4" };
        string fixedA = s[0], fixedB = s[1], fixedC = s[2];
        string ans = "";

        foreach (var x in cand)
        {
            string[] t = new string[3];
            for (int i = 0; i < 3; i++)
                t[i] = s[i] == "?" ? x : s[i];

            int a = int.Parse(t[0]);
            int b = int.Parse(t[1]);
            int c = int.Parse(t[2]);

            if (a == b || b == c || a == c) continue;
            if ( (b > a && b > c) || (b < a && b < c) )
                ans += x;
        }

        Console.WriteLine(ans);
    }
}