#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#ifdef local
#include <C++/core/io/debug_print.hpp>
#else
#define dump(...) void(0);
#endif

#include <iostream>
#include <valarray>
#include <ranges>
namespace man {

}
int main() {
    std::cin.tie(nullptr) -> sync_with_stdio(false);
    std::string n;
    int64_t k, c = 0;
    std::cin >> n >> k;
    const int m = n.size();
    std::valarray<int> v(m);
    for(const auto &i: std::views::iota(0, m)) {
        v[i] = n[i] - '0';
    }
    const auto vtoi = [](const std::valarray<int> &v) -> int64_t {
        int64_t x = 0;
        for(const auto &e: v) {
            x += e;
            x *= 10;
        }
        x /= 10;
        return x;
    };
    const auto rec = [&](const auto &f, const int d) -> void {
        if(d == m) {
            if(++c == k) {
                std::cout << vtoi(v) << '\n';
            }
            return;
        }
        for(const auto &i: std::views::iota(0, v[d] + 1)) {
            v[d] = i;
            f(f, d + 1);
        }
    };
    rec(rec, 0);
}