#define _USE_MATH_DEFINES
#pragma region include
#include <iostream>
#include <iomanip>
#include <stdio.h>

#include <sstream>
#include <algorithm>
#include <iterator>
#include <cmath>
#include <complex>

#include <string>
#include <cstring>
#include <vector>
#include <bitset>

#include <queue>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <ctime>
////
//#include <random>//
#pragma endregion //#include
/////////

#pragma region typedef
typedef long long LL;
typedef long double LD;
typedef unsigned long long ULL;
#pragma endregion //typedef
////定数
const int INF = (int)1e9;
const LL MOD = (LL)1e9+7;
const LL LINF = (LL)4e18+20;
const LD PI = acos(-1.0);
const double EPS = 1e-9;
/////////
using namespace::std;

bool check(vector<int> v){
	if( v[0]==v[1] || v[1]==v[2] || v[2]==v[0] ){
		return false;
	}
	if( v[0] < v[1] && v[2] < v[1] ){
		return true;
	}
	if( v[0] > v[1] && v[2] > v[1] ){
		return true;
	}
	return false;/////
}
void solve(){
	vector<string> Cstr(3);
	vector<int> C(3,-1);
	int pos = 0;

	for(int i=0;i<3;++i){
		cin>>Cstr[i];
		if( Cstr[i] == "?" ){
			pos = i;
		}else{
			C[i] = Cstr[i][0]-'0';
		}
	}
	C[pos] = 1;
	string ans;
	if( check(C) ){
		ans += "1";
	}
	C[pos] = 4;
	if( check(C) ){
		ans += "4";
	}
	cout<<ans<< endl;
}

#pragma region main
signed main(void){
	std::cin.tie(0);
	std::ios::sync_with_stdio(false);
	std::cout << std::fixed;//小数を10進数表示
	cout << setprecision(16);//小数点以下の桁数を指定//coutとcerrで別	

	solve();
}
#pragma endregion //main()