#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
using namespace std;


int main()
{
    int n, k;
    string s, pre, post;
    cin >> n >> k >> s;
    pre = s.substr(0, k-1);
    post = s.substr(k-1);
    if ((n-k+1)%2) reverse(pre.begin(), pre.end());
    cout << post + pre << endl;
}