#include <iostream>
#include <vector>
#include <algorithm>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl
    
using namespace std;

int main () {
    char c[3];
    REP (i, 0, 3) cin >> c[i];
    auto chk = [](char s[3]) -> bool {
	return (s[0] < s[1] && s[1] > s[2]) || (s[0] > s[1] && s[1] < s[2]);
    };
    REP (i, 0, 3) {
	if (c[i] == '?') {
	    char lst[2] = {'1', '4'};
	    REP (j, 0, 2) {
		c[i] = lst[j];
		if (chk(c)) cout << lst[j];
	    }
	}
    }
    cout << endl;
    return 0; 
}