#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<stack>
#include<queue>
#include<vector>
#include<algorithm>
#include<iomanip>
#include<cassert>

typedef long long int ll;
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define REP(i,n) for (int i=0;i<(n);i++)
#define EREP(i,n) for (int i=1;i<=(n);i++)
const int MOD = 1000000007;
const int INF = 1000000;
#define EVEL 1
#ifndef EVEL
#define DEB(X) cout << #X << ":" <<X<<" " ;
#define TF(f) f ? cout<<"true  " : cout<<"false ";
#define END cout<<"\n";
#else
#define DEB(X) {X=X;}
#define TF(f) {f=f;}
#define END {}
#endif

    string S;
    int A[3],B;

int main(){
    ios::sync_with_stdio(false);
    REP(i,3){
        cin>>S;
        if(S=="?"){A[i]=-1;B=i;}
        else A[i]=S[i]-'0';
    }
    if(B==0){
        if(A[1]>A[2])cout<<"4";
        else cout<<"1";
    }
    if(B==1){
        cout<<"14";
    }
    if(B==2){
        if(A[1]>A[2])cout<<"4";
        else cout<<"1";
    }
    return 0;
}