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

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

typedef __int128_t int128;
typedef pair<int, double> PII;
typedef pair<int, pair<int, int>> PIII;
const int N = 1e4 + 10, M = 2 * N, P = 32, INF = 0x3f3f3f3f, mod = 1e9 + 7;

double a, b;

bool check(double x)
{
    return (fabs(x - b) <= 1e-4);
}

void bfs()
{
    queue<PII> q;
    q.push({1, a});

    while (!q.empty())
    {
        auto t = q.front();
        q.pop();

        double ver = t.second;
        int x = t.first;
        if (check(ver) && x != 1) 
        {
            vector<int> res;
            while (x > 1)
            {
                res.push_back(((x & 1) ? 2 : 1));
                x >>= 1;
            }
            for (int i = res.size() - 1; i >= 0; i -- )
                cout << res[i];
            return ;
        }

        q.push({x << 1, ver * 0.5});
        q.push({(x << 1) + 1, ver * 0.5 + 0.5});
    }
}

signed main()
{   
    cin >> a >> b;

    bfs();
    

    return 0;
}