#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)

template<typename T>
bool chmin(T &x, T y) { return x > y ? (x = y, true) : false; }
template<typename T>
bool chmax(T &x, T y) { return x < y ? (x = y, true) : false; }

struct io_setup {
	io_setup() {
		ios::sync_with_stdio(false);
		std::cin.tie(nullptr);
		cout << fixed << setprecision(15);
	}
} io_setup;

int main(){
	string n;
	ll k;
	cin>>n>>k;
	k--;
	int m=n.size();
	string ans;
	rep(i,0,m){
		{
			double tmp=1;
			rep(j,i+1,m) tmp*=(n.at(j)-'0')+1;
			if(tmp>k){
				ans+="0";
				continue;
			}
		}
		ll tmp=1;
		rep(j,i+1,m) tmp*=(n.at(j)-'0')+1;
		ans+=(k/tmp+'0');
		k%=tmp;
	}
	cout<<stoll(ans)<<endl;
}