#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    vector<vector<int>> a(2, vector<int>(3));
    int hatena[2] = {1,4};

    REP(j, 3)
    {
        char c;
        cin >> c;

        REP(i, 2)
        {
            if(c == '?') a[i][j] = hatena[i];
            else a[i][j] = c - '0';
        }
    }

    REP(i, 2)
    {
        if( min(min(a[i][0],a[i][1]),a[i][2]) == a[i][1])
            cout << hatena[i];
        if( max(max(a[i][0],a[i][1]),a[i][2]) == a[i][1])
            cout << hatena[i];
    }

    cout << endl;
}