#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     int n, k;     cin >> n >> k;     string s, st =   ;     cin >> s;     vector<int> m(28);     vector<int> l(28);     for (int i = 0; i < n; i++) {       m[((int)s[i]) - 97]++;     }     if (n == k) {       cout <<   n ;       return 0;     }     while (k > 0) {       for (int i = 0; i < 27; i++) {         if (k >= m[i]) {           k -= m[i];           l[i] = m[i];         } else {           m[i] = k;           l[i] = k;           k = 0;         }         if (k == 0) {           break;         }       }     }     for (int i = 0; i < n; i++) {       if (l[((int)s[i]) - 97] > 0) {         l[((int)s[i]) - 97]--;         continue;       } else         cout << s[i];     }     return 0;   }   