#include <bits/stdc++.h>
#define int long long
#define double long double
#define ios ios::sync_with_stdio(0), cin.tie(0)
#define fc first
#define sc second
#define setbit(x, y) x |= (1 << y)
#define clrbit(x, y) x &= ~(1 << y)
#define reversebit(x, y) x ^= (1 << y)
#define getbit(x, y) ((x) >> (y)&1)
using namespace std;
typedef long long LL;

const int mod = 1e9 + 7, N = 2e5 + 10;
string res;

void bfs(double a,double b,string s,int x){
    if(x>20)return;
    if(abs(a-b)<1e-5){
        res=s;
        return;
    }
    bfs(a*0.5,b,s+'1',x+1);
    bfs(a*0.5+0.5,b,s+'2',x+1);
}

signed main()
{
    ios;
    double a,b;
    cin>>a>>b;
    string s;
    bfs(a,b,s,0);
    cout<<res<<'\n';
    return 0;
}