#include <bits/stdc++.h>
using namespace std;
//upper_bound	>
//lower_bound	>=
#define LL long long
#define ULL unsigned long long
#define PII pair<int,int>
#define YES cout<<"YES\n"
#define NO cout<<"NO\n"
#define PI acos(-1)
#define endl '\n'
#define ee cout<<'\n';
#define __lcm(a, b) a*b/__gcd(a,b)
#define fo(a,b,c) for(int a=b;a<=c;a++)
#define of(a,b,c) for(int a=b;a>=c;a--)
#define debug(x) cout<<#x<<' '<<x<<endl;
#define nep next_permutation
#define prep prev_permutation
#define g(a) a,vector<a>,greater<a>
#define all(a) a.begin(),a.end()
#define alls(a) a.begin()+1,a.end()
#define int long long
//const int p = 998244353, pp = 1000000007;
LL qmi(LL a,LL b,LL mod){LL res=1;while(b){if(b&1)res=res*a%mod;b>>=1;a=a*a%mod;}return res;	}
const int N = 2000010, M = 4000010;
bool flag = 0;
void dfs(double a, double b, string s)
{
	if (flag) return;
	if (s.size() > 50) return;
	if (abs(a - b) <= 1e-4) 
	{
		cout << s;
		flag = 1;
		return;
	}

	dfs(a * 0.5, b, s + '1');
	dfs(a * 0.5 + 0.5, b, s + '2');
}
void solve()
{
	double a, b;
	cin >> a >> b;
	string s;
	dfs(a, b, s);
	
}
signed main()
{
 	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
//	int T; cin >> T; while (T --)
	solve();
}