#include "bits/stdc++.h"
using namespace std;
double eps = 1e-4;
void solve()
{
	double a,b;
	cin >> a >> b;
	for (int i = 0; i < (1 << 20); i++) {
		double rs = a;
		string p = "";
		for (int j = 0; j < 20; j++) {
			if (i >> j & 1) {
				rs = rs * 0.5;
				p += '1';
			} else {
				rs = rs * 0.5 + 0.5;
				p += '2';
			}
			if (fabs(rs - b) <= eps) {
				cout << p << '\n';
				return;
			}
		}
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr), cout.tie(nullptr);
	int T = 1;
	while (T --) {
		solve();
	}
	return 0;
}