#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, K;
  cin >> N >> K;
  string S;
  cin >> S;
  if ((N - K) % 2 == 0){
    for (int i = K - 1; i < N; i++){
      cout << S[i];
    }
    for (int i = K - 2; i >= 0; i--){
      cout << S[i];
    }
    cout << endl;
  } else {
    for (int i = K - 1; i < N; i++){
      cout << S[i];
    }
    for (int i = 0; i <= K - 2; i++){
      cout << S[i];
    }
    cout << endl;
  }
}