#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
ll n,k;
ll tot;
ll check(int x){
	if(x==0) return 1;
	ll cnt=0,t;
	while(x){
		t=x%10;
		x/=10;
		if(t==0) cnt++;
	}
	return cnt;
}
int main(){
	freopen("whz_number.in","r",stdin);
	freopen("whz_number.out","w",stdout);
	ll res;
	while(scanf("%d%d",&n,&k)!=EOF){
		tot=0;
		for(long long i=n;i>=0;i--){
			res=check(i);
			if(tot+res>k) continue;
			tot+=res;
			if(tot==k){
				printf("%lld\n",i);
				break;
			}
		}
	}
	return 0;
}