#define _CRT_SECURE_NO_WARNINGS
////#pragma GCC optimize(1)
////#pragma GCC optimize(2)
////#pragma GCC optimize(3,"Ofast","inline")
#include<bits/stdc++.h>
using namespace std;
#define N 2000005 
#define M 1331 
#define PII pair<int,int>
#define PIII pair<pair<int,int>,int>  
#define VPII vector<PII>
#define VPIII vector<PIII>
#define endl "\n"
#define inf 0x3f3f3f3f3f3f  
#define ll long long
#define ull unsigned long long
const double eps = 1e-6;
#define IOS ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define mod 1000000007
ll n, m,k;
bool f = 0;
void dfs(string str, double s,double b,int ans) {
	if (fabs(s - b) <= 0.0001&&f!=0)
	{
		//cout << s << " " << b << endl;
		cout << str << "\n";
		exit(0);
	}
	f = 1;
	//cout << ans << endl;
	if (ans >= 15)
	{
		return;
	}
	dfs(str + '1', s * 0.5, b,ans+1);
	dfs(str + '2', (s - 1.0) * 0.5 + 1.0, b,ans+1);

}
int main() {
	IOS;
	/*int t;
	cin >> t;
	while (t--) {
		solve();
	}*/
	string sty;
	long double s = 0.5;
	long double a, b;
	cin >> a >> b;
		f = 0;
	dfs(sty, a,b,0);
	return 0;
}