using System;

class Program
{
    static void Main()
    {
        string[] s = Console.ReadLine()!.Split();
        string[] candidates = { "1", "4" };
        string result = "";

        foreach (var c in candidates)
        {
            string[] arr = (string[])s.Clone();
            for (int i = 0; i < 3; i++)
            {
                if (arr[i] == "?")
                    arr[i] = c;
            }

            int a = int.Parse(arr[0]);
            int b = int.Parse(arr[1]);
            int cNum = int.Parse(arr[2]);

            if (a != b && b != cNum && a != cNum && (b == Math.Max(a, Math.Max(b, cNum)) || b == Math.Min(a, Math.Min(b, cNum))))
            {
                result += c;
            }
        }

        Console.WriteLine(result);
    }
}