/* -*- coding: utf-8 -*-
 *
 * 1020.cc:  No.1020 Reverse - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

/* global variables */

char s[MAX_N + 4];

/* subroutines */

/* main */

int main() {
  int n, k;
  scanf("%d%d%s", &n, &k, s);
  k--;

  for (int i = k; i < n; i++) putchar(s[i]);

  if ((n - k) & 1)
    for (int i = k - 1; i >= 0; i--) putchar(s[i]);
  else
    for (int i = 0; i < k; i++) putchar(s[i]);
  putchar('\n');
  return 0;
}