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

int main() {
    int n, k;
    cin >> n >> k;
    string s;
    cin >> s;

    string result = ""s;
    for(int i=k-1; i<n; i++) result += s[i];
    if((n+1-k) % 2 == 1) {
        reverse(s.begin(), s.begin() + k - 1);
    }
    rep(i, k-1) result += s[i];
    
    cout << result << "\n";
}