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

#define endl '\n'
#define int long long

void run()
{
    double a, b;
    cin >> a >> b;

    queue<pair<double, string>> q;

    unordered_set<double> s;
    q.push({a, ""});
    s.insert(a);

    while (q.size())
    {
        auto idx = q.front();
        q.pop();
        s.erase(idx.first);

        if (fabs(idx.first - b) <= 1e-4)
        {
            cout << idx.second << endl;
            break;
        }

        double x = idx.first * 0.5, y = idx.first * 0.5 + 0.5;

        if (s.count(x) == 0)
        {
            s.insert(x);
            q.push({x, idx.second + '1'});
        }
        if (s.count(y) == 0)
        {
            s.insert(y);
            q.push({y, idx.second + '2'});
        }
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int tt = 1;

    while (tt--)
        run();
}