#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(int)(n); i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main() {
  int n, k; cin >> n >> k;
  string s; cin >> s;
  
  for (int i = 0; i<n-k+1; i++) {
    reverse(&s[i], &s[i+k]);
  }
  cout << s << endl;
  
  
}