#include<bits/stdc++.h>
using namespace std;
string a;

int k;
int main(){
//	freopen("delete.in","r",stdin);
//	freopen("delete.out","w",stdout);
	cin>>a>>k;
	int len=a.length(),i=-1;
	a[len]='0';
	while(k>0){
		i++;
		int id=i+1;
		if(a[i]!='a'){
			if(a[id]=='a'){
				while(a[id]=='a')id++;
			}
			if(a[i]>a[id]){
				k--;

				a[i]='a';
				while(a[i]=='a')i--;
				i--;
			}
		}
		else continue;
	}
	i=0;
	while((a[i]=='0')||(a[i]=='a'))i++;
	for(i;i<len;i++){
		if(a[i]!='a'){
			cout<<a[i];
		}
	}
	return 0;
}