#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define fore(i,a) for(auto &i:a)
typedef long long ll;
typedef pair <int, int> P;
template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }
const int  INF = 2147483647;
const ll INFL = 9223372036854775807;
const ll mod = 1000000007;



int main() {
	int l1, c1, r1;
	int l2, c2, r2;
	REP(i, 3) {
		char c;
		cin >> c;
		if (i == 0) {
			if (c == '?') {
				l1 = 1;
				l2 = 4;
			}
			else l1 = l2 = c - '0';
		}else if (i == 1) {
			if (c == '?') {
				c1 = 1;
				c2 = 4;
			}
			else c1 = c2 = c - '0';
		}else if (i == 2) {
			if (c == '?') {
				r1 = 1;
				r2 = 4;
			}
			else r1 = r2 = c - '0';
		}
	}
	if (l1 > c1&&c1 < r1)cout << 1;
	else if(l1 < c1&&c1 > r1)cout << 1;
	if (l2 > c2&&c2 < r2)cout << 4;
	else if (l2 < c2&&c2 > r2)cout << 4;
	cout << endl;

	
	return 0;
}