#include <bits/stdc++.h>

using namespace std;

const int CMAX = 2e5+15;
int n, k , misc = 0;
char s[CMAX];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> k;
    for(int i=0;i<=n-1;i++)
    {
        cin >> s[i];
        if(i!=0&&misc<k)
        {
            while(s[i]>s[i-1]&&misc<k&&i>0)
            {
                s[i-1] = s[i];
                i--;
                n--;
                misc++;
            }
        }
    }
    while(misc<k)
    {
        n--;
        misc++;
    }
    s[n] = '\0';
    //vezi ca esti cu o pozitie in spate i-1
    cout << s;
    return 0;
}