#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int count_zero(ll x) {
	if(x==0)return 1;
	int cnt=0;
	while(x) {
		if(x%10==0)cnt++;
		x/=10;
	}
	return cnt;
}
ll total_zero(ll a,ll b) {
	ll res=0;
	for(ll i=a; i<=b; i++)res+=count_zero(i);
	return res;
}
int main() {
	freopen("whz_number.in","r",stdin);
	freopen("whz_number.out","w",stdout);
	ll n;
	int k;
	while(scanf("%lld%d",&n,&k)==2) {
		ll ans=0;
		for(ll m=n; m>=0; m--) {
			ll zeros=total_zero(m,n);
			if(zeros==k) {
				ans=m;
				break;
			}
		}
		printf("%lld\n",ans);
	}
	return 0;
}