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

const double eps = 1e-6;
int main() {
    double a, b; cin >> a >> b;
    string ans = "";
    if (b <= eps) {
        while (a > eps) {
            ans += '1';
            a /= 2.0;
        }
    } else {
        while (abs(b - a) > eps) {
            if (b - 0.5 >= eps) {
                b = (b - 0.5) * 2.0;
                ans += '2';
            } else {
                b = b * 2.0;
                ans += '1';
            }
        }
        reverse(ans.begin(), ans.end());
    }
    
    cout << ans << '\n';
    
    return 0;
}