#include<bits/stdc++.h>

using namespace std;

int main(){
    long long n,k;
    cin >> n >> k;
    if(k == 1){
        cout << 0 << endl;
        return 0;
    }
    vector<long long> a(20,1);
    int now = 0;
    while(n > 0){
        now++;
        a[now] = a[now - 1] * (n % 10 + 1);
       
        n /= 10;
    }
    // for(int j = 0;j <= now;j++){
    //     cout << a[j] << " ";
    // }
    // cout << endl;
    bool c = 0;
    k--;
    for(int j = now;j >= 0;j--){
        //cout << k << endl;
        if((k / a[j] > 0) || c == 1){
            cout << k / a[j];
            c = 1;
        }
        k %= a[j];
    }
    
    cout << endl;
    return 0;
}