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

const double eps = 1e-4;
int main() {
    double a, b; cin >> a >> b;
    string ans = "";
    if (b <= eps) {
        cout << string(40, '1') << '\n';
    } else {
        while (abs(b - a) > eps) {
            if (b - 0.5 > eps) {
                b = (b - 0.5) * 2.0;
                ans += '2';
            } else {
                if (abs(b - 0.5) <= eps) {
                    if (a <= eps) b = (b - 0.5) * 2.0, ans += '2';
                    else b = b * 2.0, ans += '1';
                } else {
                    b = b * 2.0;
                    ans += '1';
                }
            }
            // if (abs(b - 1) > eps)
            //     cout << fixed << setprecision(8) << a << ' ' << b << '\n';
            // else break;
        }
        reverse(ans.begin(), ans.end());
        cout << ans << '\n';
    }
    
    
    return 0;
}