#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;

int main() {
    char c[3];

    int j;
    for (int i = 0; i < 3; i++) {
        cin >> c[i];
        if (c[i] == '?') j = i;
    }

    string s;
    for (int i = 0; i < 2; i++) {
        char t = i == 0 ? '1' : '4';
        c[j] = t;
        if ((c[1] < c[0] && c[1] < c[2]) || (c[1] > c[0] && c[1] > c[2])) s += t;
    }

    cout << s << endl;

    return 0;
}