#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

bool check(const vector<int>& c) {
	if (c[0] == c[1] || c[0] == c[2] || c[1] == c[2])  {
		return false;
	}
	return (c[0] < c[1] && c[1] > c[2]) || (c[0] > c[1] && c[1] < c[2]);
}

string solve(const vector<string>& input, string str) {
	vector<string> cs = input;
	for (auto& v : cs) {
		if (v == "?") {
			v = str;
		}
	}

	vector<int> c(3);
	for (int i = 0; i < c.size(); i++) { 
		c[i] = stoi(cs[i]);
	}

	return check(c) ? str : "";
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	vector<string> input(3);
	for (int i = 0; i < 3; i++) {
		cin >> input[i];
	}

	cout << solve(input, "1") + solve(input, "4") << endl;
	return 0;
}