#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define SZ(v) ((int)((v).size()))
void run () {
    int n, k;
    cin >> n >> k;
    string s;
    cin >> s;
    int freq[30] = {0};
    for (int i = 0; i < n; ++i) {
        freq[s[i] - 'a']++;
    }
    int pos = 26; // i considered it iterate over 'z'
    for (int i = 0; i < 26; ++i) {
        if (k >= freq[i]) {
            k -= freq[i];
        } else {
            pos = i; // i got the minimum char
            break;
        }
    }
    string res;
    int rem = k;
    for (int i = 0; i < n; ++i) {
        int cur_char = s[i] - 'a';
        if (cur_char > pos || (cur_char == pos && rem == 0)) {
            // so i can add this char in the result string
            res += s[i];
        } else if (cur_char == pos) {
            // here rem or k greater than or equal one so i have to reduce this operations
            --rem;
        }
    }
    cout << res << '\n';
}
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
//    freopen("/home/hamoudi/clion/hello.in", "rt", stdin);
    int tt;
    tt = 1;
//    cin >> tt;
    while (tt--)
        run();
}
/*

 */