#include <bits/stdc++.h>
using namespace std;
using ll = long long;

void solve() {
    double a, b;
    cin >> a >> b;
    map<double, int> mp;
    queue<pair<double, string>> q;
    q.push({a, ""});
    mp[a] = 1;
    while (q.size()) {
        auto [d, c] = q.front();
        q.pop();
        if (fabs(d - b) < 1e-4) {
            cout << c << '\n';
            return;
        }
        if (!mp.count(d / 2)) {
            q.push({d / 2, c + "1"});
            mp[d / 2] = 1;
        }
        if (!mp.count((d + 1) / 2)) {
            q.push({(d + 1) / 2, c + "2"});
            mp[(d + 1) / 2] = 1;
        }
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t = 1;
    // cin >> t;
    while (t--) solve();
#ifdef DEBUG
    cout << "\n----------------\n";
    cout << fixed << setprecision(6);
    cout << "Times: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
#endif
}