#include <iostream>
#include <queue>
using namespace std;
double x,y;
int main()
{
    cin>>x>>y;
    queue<pair<double,string> > q;
    q.push({x,""});
    pair<double,string>p;
    while(q.size()>0)
    {
        p=q.front();
        q.pop();
        if(abs(p.first-y)<=0.0001)
        {
            cout<<p.second;
            return 0;
        }
        q.push({p.first*0.5,p.second+'1'});
        q.push({(p.first-1)*0.5+1,p.second+'2'});
    }
    return 0;
}