#include <bits/stdc++.h>
using namespace std;
typedef __int128 ll;
bool read(ll &x){
	long long val;
	if(scanf("%lld",&val)==EOF)return 0;
	x=val;return 1;
}
void write(ll x){
	long long val=x;
	printf("%lld\n",val);
	return;
}
ll count(ll x){
	int res=(x==0);
	while(x){
		if(!(x%10))res++;
		x/=10;
	}
	return res;
}
ll n,k;
void work(){
	k-=count(n);
	while(k)n--,k-=count(n);
	write(n);
	return;
}
int main(){
	freopen("whz_number.in","r",stdin);
	freopen("whz_number.out","w",stdout); 
	while(read(n))read(k),work();
	return 0;
}