#include<bits/stdc++.h>
#define int unsigned long long
using namespace std;
bool flag;
signed main(){
	freopen("whz_number.in","r",stdin);
	freopen("whz_number.out","w",stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int a,b;
	while(cin>>a>>b){
		flag=true;
		for(int i=a;i>=0;i--){
			for(int j=i;j;j/=10){
				if(j%10==0){
					b--;
				}
				if(j==0){
					break;
				}
			}
			if(b==0){
				cout<<i<<endl;
				flag=false;
				break;
			}
		}
		if(flag==true){
			cout<<0<<endl;
		}
	}
	return 0;
}