#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;
  
  string ls = s.substr(k-1,n);
  string rs = s.substr(0, k-2);
  if ((n-k+1)%2 == 0) reverse(rs.begin(), rs.end()); 
  cout << ls << rs << endl; 
}