#include <bits/stdc++.h>

template<typename T, std::size_t N> std::istream& operator>>(std::istream& is, std::array<T, N>& v) { for (auto& i : v) is >> i; return is; }
template<typename T, std::size_t N> std::ostream& operator<<(std::ostream& os, std::array<T, N>& v) { for (auto& i : v) os << i << " "; return os; }
template<typename T> std::istream& operator>>(std::istream& is, std::vector<T>& v) { for (auto& i : v) is >> i; return is; }
template<typename T> std::ostream& operator<<(std::ostream& os, std::vector<T>& v) { for (auto& i : v) os << i << " "; return os; }
template<typename T> auto dbug(const std::initializer_list<T>& a) { std::cerr << "dbug: "; for (auto& i : a) std::cerr << i << " "; std::cerr << std::endl; }

using i64 = long long;

constexpr double eps = 1e-4, s = 0.5;

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

    double a, b;
    std::cin >> a >> b;

    std::string ans;

    std::queue<std::pair<double, std::string>> q;
    q.emplace(a, "");
    while (!q.empty()) {
        auto [x, res] = q.front();
        q.pop();
        if (std::fabs(x - b) <= eps) {
            std::cout << res << "\n";
            return 0;
        }
        q.emplace(x * s, res + '1');
        q.emplace((x - 1) * s + 1, res + '2');
    }

    return 0;
}