text: """
  This is just an example for replacing only for a specific count
  Reference Problem
  
  You are given a string s consisting of n lowercase Latin letters. Polycarp wants to remove exactly k characters (k≤n) from the string s.
  Polycarp uses the following algorithm k times:
  
  Algorithm as follows:
  a. if there is at least one letter 'a', remove the leftmost occurrence and stop the algorithm, otherwise go to next item;
  b. if there is at least one letter 'b', remove the leftmost occurrence and stop the algorithm, otherwise go to next item;
  ...
  z. remove the leftmost occurrence of the letter 'z' and stop the algorithm.
  This algorithm removes a single letter from the string. Polycarp performs this algorithm exactly k times, thus removing exactly k characters.
  
  Help Polycarp find the resulting string.
  
  Input:
  The first line of input contains two integers n and k (1≤k≤n≤4⋅105) — the length of the string and the number of letters Polycarp will remove.
  The second line contains the string s consisting of n lowercase Latin letters.
  
  Output:
  Print the string that will be obtained from s after Polycarp removes exactly k letters using the above algorithm k times.
  
  If the resulting string is empty, print nothing. It is allowed to print nothing or an empty line (line break).
  
  """
  
  n, k = map(int, input().split())
  string = input()
  hmap = "abcdefghijklmnopqrstuvwxyz"
  
  scnt = 0
  
  for c in hmap:
      if k < 1:
          break
      scnt = string.count(c)
      string = string.replace(c, "", min(scnt, k))
      k -= scnt
  
  print(string)
  