#include <bits/stdc++.h>   using namespace std;   const int INF = 1000000000;   const int MAX = 400005;   const int MAX1 = 2007;   const int MAX2 = 4007;   const int LEN = 21;   const int BASE = 1000000000;   const double EPS = 1e-7;   const int MOD = 1234567891;   vector<pair<char, int> > vec;   int main(void) {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     ifstream in(  );     ofstream out(  );     int n, k;     cin >> n >> k;     string s;     cin >> s;     for (int i = (0); i < ((int)s.size()); ++i) {       vec.push_back(make_pair(s[i], i));     }     sort(vec.begin(), vec.end());     char ans[MAX];     memset(ans,   0 , sizeof(ans));     for (int i = (k); i < ((int)vec.size()); ++i) {       ans[vec[i].second] = vec[i].first;     }     for (int i = (0); i < (n); ++i) {       if (ans[i] !=   0 ) cout << ans[i];     }     cout << endl;     return 0;   }   