#include <bits/stdc++.h>
using namespace std;
#define IOS cin.tie(0), ios::sync_with_stdio(false)
#define endl '\n'
#define int long long
#define pii pair<int, int>
#define mod 998244353
const int N = 1e6 + 6;
void solve()
{
    double x, y;
    cin >> x >> y;
    queue<pair<double, string>> q;
    q.push({x, ""});
    while (q.size())
    {
        // cout << q.front().first - y << endl;
        if (abs(q.front().first - y) < 0.000001)
        {
            cout << q.front().second << endl;
            return;
        }
        auto k = q.front();
        q.pop();
        q.push({k.first * 0.5, k.second + "1"});
        q.push({k.first * 0.5 + 0.5, k.second + "2"});
    }
}
signed main()
{

     IOS;
    int t;
    t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
    // cout << ans << endl;
   // system("pause");
}