#define _USE_MATH_DEFINES

#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max,count
#include <string>	//string,getline
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap, pair
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt,ceil,M_PI, pow, sin
#include <sstream>	//stringstream,getline
#include <numeric>	//gcd, accumlate
#include <deque>	//deque
#include <random>	//randam_device

using namespace std;

inline bool Kadomatsu(int a, int b, int c) {

	if (a == b || b == c || c == a) {
		return false;
	}
	if (b == max({ a, b, c }) || b == min({ a, b, c })) {
		return true;
	}
	else {
		return false;
	}
	
}

int main() {

	int a[3];
	int idx = 0;
	string temp;
	for (int i = 0; i < 3; i++) {
		cin >> temp;
		if (temp == "?") {
			idx = i;
		}
		else {
			a[i] = stoi(temp);
		}
	}

	a[idx] = 1;
	if (Kadomatsu(a[0], a[1], a[2])) {
		cout << 1;
	}
	a[idx] = 4;
	if (Kadomatsu(a[0], a[1], a[2])) {
		cout << 4;
	}

	cout << endl;

	return 0;

}