#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    string c[3];
    for(int i = 0; i < 3; i++){
        cin >> c[i];
    }
    int array_14[2] = {1, 4};
    for(int i = 0; i < 2; i++){
        int new_c[3];
        for(int j = 0; j < 3; j++){
            if(c[j] == "?"){
                new_c[j] = array_14[i];
            }else{
                new_c[j] = stoi(c[j]);
            }
        }
        if(max(new_c[0], new_c[2]) < new_c[1] || min(new_c[0], new_c[2]) > new_c[1]){
            cout << array_14[i];
        }
    }
    cout << endl;
}