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

const double eps = 1e-6;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cout << fixed << setprecision(5);

    string ans;
    double a, b;
    cin >> a >> b;
    while (abs(a - b) > eps) {
        if (a > b) {
            a /= 2;
            ans += '1';
        } else {
            a = (a - 1) / 2 + 1;
            ans += '2';
        }
    }

    cout << ans << '\n';

    return 0;
}