#include<bits/stdc++.h>
using namespace std;

const double eps = 1e-4;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	double a, b;
	cin >> a >> b;

	const double s = 0.5;
	auto up = [&](double &v) -> void {
		v = (v - 1) * s + 1;
	};

	auto down = [&](double &v) -> void {
		v = v * s;
	};

	string ans;
	while(fabs(a - b) > eps) {
		if(a < b) {
			up(a);
			ans += '2';
		} else {
			down(a);
			ans += '1';
		}
	}
	cout << ans << '\n';
	return 0;
}