public static void main(String[] args) throws IOException {
        Reader sc = new Reader();
        int n = sc.nextInt(), k =sc.nextInt();
        sc.readLine();
        String str = sc.readLine().trim();
        int[] count = new int[26];
        for(char c : str.toCharArray()) {
        	count[c-97]++;
        }
        int idx = 0;
        StringBuilder r = new StringBuilder(str);
        while(k > 0) {
        	int times = count[idx];
        	char c = (char) (idx+97);
        	if(times == 0) {
        		idx++;
        	} else {
        		for(int i = 0; i < times;i++) {
        			r.setCharAt(r.indexOf(String.valueOf(c)),' ');
        			k--;
        			if(k == 0) {
        				break;
        			}
        		}
        	}
        	idx++;
        }

        p(r.toString().replaceAll(" ", ""));
        sc.close();
    }