#include <bits/stdc++.h>
#define endl "\n"
#define int long long
using namespace std;

const double eps = 1e-4;

void solve() {
    double a, b;
    cin >> a >> b;
    queue<pair<double, string>> q;
    q.push({a, ""});
    while (q.size()) {
        auto [x, ans] = q.front();
        q.pop();
        if (fabs(x - b) < eps) {
            cout << ans << "\n";
            break;
        }
        q.push({x * 0.5, ans + '1'});
        q.push({x * 0.5 + 0.5, ans + '2'});
    }
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    
    int T = 1;
    // cin >> T;
    while (T--) {
        solve();
    }
    return 0;
}