import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String [] s = new String[3];
        for(int i = 0; i < 3; i++) {
            s[i] = sc.next();
        }
        for(int i = 0; i < 3; i++) {
            if("?".equals(s[i])) {
                function(s,i);
            }
        }
        System.out.println();
    }
    
    static void function(String[]s, int index) {
        String [] replace = {"1","4"};
        for(int i = 0; i < replace.length; i++) {
            s[index] = replace[i];
            if(check(s)) {
                System.out.print(replace[i]);
            }
        }
    }
    
    static boolean check(String[]s) {
        if(s[0].compareTo(s[1]) * s[2].compareTo(s[1]) > 0) {
            return true;
        }
        return false;
    }
}