#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  int n, k;
  cin >> n >> k;
  string s;
  cin >> s;
  int c = 0;
  for (int i = k - 1; i < n; i++) {
    cout << s[i];
    c++;
  }
  if (c % 2 == 1) {
    for (int i = k - 2; i >= 0; i--) {
      cout << s[i];
    }
  } else {
    for (int i = 0; i <= k - 2; i++) {
      cout << s[i];
    }
  }
  cout << endl;
  return 0;
}