#include <bits/stdc++.h>

using namespace std;

int main() {
    // freopen ("J.in", "r",stdin);
    double a, b;
    cin >> a >> b;
    queue<double> q;
    q.push(a);
    unordered_map<double, string> mp;

    while (q.size()) {
        auto t = q.front();
        q.pop();

        if (fabs(t - b) < 1e-5) {
            cout << mp[t] << endl;
            return 0;
        }

        if (!mp.count(t * 0.5)) {
            double x = t * 0.5;
            mp[x] = mp[t] + "1";
            q.push(x);
        }

        if (!mp.count(t * 0.5 + 0.5)) {
            double x = t * 0.5 + 0.5;
            mp[x] = mp[t] + "2";
            q.push(x);
        }
    }
    return 0;
}