#ifdef LOCAL
#include <local.hpp>
#else
#pragma GCC optimize("O3")
// #pragma target("arch=skylake-avx512")
#include <bits/stdc++.h>
#define debug(...) ((void)0)
#endif

using namespace std;
using ll = long long;
using ld = long double;

void solve(int) {
    string N;
    cin >> N;

    vector<ll> num;
    for (int i = 0; i < (int)N.size(); i++) {
        num.push_back(N[i] - '0' + 1);
    }
    reverse(num.begin(), num.end());

    debug(num);

    ll K;
    cin >> K;
    K -= 1;

    vector<ll> ans;

    for (auto&& x : num) {
        ans.push_back(K % x);
        K /= x;
        if (K == 0) break;
    }
    reverse(ans.begin(), ans.end());

    for (auto&& x : ans) {
        cout << x;
    }
    cout << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1;
    // cin >> t;
    for (int i = 1; i <= t; i++) {
        solve(i);
    }

#ifdef LOCAL
    postprocess();
#endif
}