#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    string S;
    cin >> S;
    ll K;
    cin >> K;
    int N = S.size();
    K--;

    string ans = "";
    for (int i = 0; i < N; i++) {
        ll cnt = 1;
        for (int j = i + 1; j < N; j++) cnt *= S[j] - '0' + 1;

        ans += char('0' + K / cnt);
        K %= cnt;
    }

    while (ans.size() > 1 && ans.front() == '0') {
        ans.erase(ans.begin());
    }

    cout << ans << endl;
}