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

#define ll long long
#define endl '\n'

const int N = 1e7 + 10;
const int mod = 998244353;

// int ans[N];
int jc[N];

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

    map<double, bool> mp;
    queue<pair<double, string>> q;

    mp[a] = 1;
    q.push({a, ""});

    while (q.size())
    {
        auto top = q.front();
        q.pop();

        auto f = top.first;

        if (fabs(f - b) <= 1e-4)
        {
            cout << top.second;
            return;
        }

        double idx1 = f * 0.5, idx2 = (f - 1) * 0.5 + 1;

        if (mp[idx1] == 0)
        {
            mp[idx1] = 1;
            q.push({idx1, top.second + '1'});
        }
        if (mp[idx2] == 0)
        {
            mp[idx2] = 1;
            q.push({idx2, top.second + '2'});
        }
    }
}

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

    int tt = 1;
    // cin >> tt;

    while (tt--)
        run();
}