#include <bits/stdc++.h>

using namespace std;

const int N = 2e3+10;

map<double,int> vs;
map<double,string> ji;

int main (){
	double a,b;
	double s =0.5;
	cin>>a>>b;
	
	queue<double> res;
	
	res.push(a);
	vs[a]=1;
	
	while(!res.empty()){
		double top = res.front();
		res.pop();
		
		if(abs(top - b) <= 1e-4){
			cout<<ji[top]<<endl;
			break;
		}
		
		double t1 = top * s;
		double t2 = ( top - 1 ) * s + 1;

		if(vs[t1] == 0 ){
			vs[t1] = 1;
			string str = ji[top]+'1';
			ji[t1] = str;
			res.push(t1);
		}
		
		if(vs[t2]==0){
			vs[t2] = 1;
			string str = ji[top]+'2';
			ji[t2] = str;
			res.push(t2);
		}
		
	}
	
}