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

using i64 = long long;

int __OneWan_2024 = [](){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	return 0;
}();
map<double, int> dist;
map<double, string> way;
int main() {
	double a, b;
	cin >> a >> b;
	dist[a] = 0;
	queue<double> que;
	que.push(a);
	while (!que.empty()) {
		double x = que.front();
		que.pop();
		if (fabs(x - b) < 1e-5) {
			cout << way[x] << "\n";
			break;
		}
		{
			double tx = x * 0.5;
			if (!dist.count(tx)) {
				dist[tx] = dist[x] + 1;
				way[tx] = way[x] + "1";
				que.push(tx);
			} else {
				if (dist[tx] > dist[x] + 1) {
					dist[tx] = dist[x] + 1;
					way[tx] = way[x] + "1";
					que.push(tx);
				}
			}
		}
		{
			double tx = (x + 1) / 2;
			if (!dist.count(tx)) {
				dist[tx] = dist[x] + 1;
				way[tx] = way[x] + "2";
				que.push(tx);
			} else {
				if (dist[tx] > dist[x] + 1) {
					dist[tx] = dist[x] + 1;
					way[tx] = way[x] + "2";
					que.push(tx);
				}
			}
		}
	}
	return 0;
}