#include <iostream>
#include <vector>
using namespace std;

string solution(vector<int> a, vector<int> b, vector<string> s) {

    vector<int> an, bn; vector<string> result;

    for (int i=0; i<a.size(); ++i) {
        if (a[i]==b[i])
            return s[i];

        an.push_back(a[i]+1);
        bn.push_back(b[i]*2);
        result.push_back(s[i]+"1");

        an.push_back(a[i]*2);
        bn.push_back(b[i]+1);
        result.push_back(s[i]+"2");
    }
    return solution(an, bn, result);
}

int main() {
    vector<int> a(1), b(1);
    cin >> a[0] >> b[0];
    vector<string> s; s.push_back("");
    cout << solution(a, b, s);
    return 0;
}