#include <bits/stdc++.h>   using namespace std;   int cnt[300007];   int main() {     int n, k;     scanf( %d%d , &n, &k);     string s;     cin >> s;     int check = 100;     for (int i = (0); i <= ((int)s.size() - 1); ++i) ++cnt[s[i] -  a ];     for (int i = ( a ); i <= ( z ); ++i) {       if (k >= cnt[i -  a ])         k -= cnt[i -  a ];       else {         cnt[i -  a ] -= k;         check = i -  a ;         break;       }     }     string str =   ;     for (int i = (0); i <= ((int)s.size() - 1); ++i) {       if (s[i] -  a  < check) continue;       if (s[i] -  a  == check) {         if (k) {           --k;           continue;         }       }       str += s[i];     }     cout << str << endl;     return 0;   }   