#pragma GCC optimize(1)
#pragma GCC optimize(2)
#pragma GCC optimize(3,"Ofast","inline")
#include<bits/stdc++.h>
#define int long long
#define double long double
using namespace std;
constexpr int inf=0x7fffffff;
constexpr double eps=1e-4;
signed main(){
    std::cin.tie(0)->sync_with_stdio(0);
    double a,b;cin>>a>>b;
    string s="";
    while(a-0.0>=eps) a/=2.0,s+="1";
    while(abs(a-b)>=eps)
        if(a-b>eps) a/=2.0,s+="1";
        else a=a/2.0+0.5,s+="2";
    cout<<s<<"\n";
    return 0;
}